I've been using cameras with the 30 minute limit for years. I video primarily plays, concerts, recitals, etc, many which exceed the 30 minute limit by a lot. All I do is wait for a pause in the action before the 30 minute limit, stop and restart the video and do this as many times as is necessary. Usually it's well before the limit as scenes change or a different group takes the stage because there is a lot of useless down time I don't wish to record. I then stitch the videos together with a video editor. I've been doing this for about 10 years and have never, repeat never, found the 30 minute limit a limitation.
The only time I can see it as a problem is if you set the camera up and leave it unattended which I never do. I would be interested in hearing from any of you for whom the 30 minute limit is a real problem and what the circumstances are.
I'm one of the people that has found I need the extra limit. Lets see in the last two years, I have had the following times when I was glad neither the G85 nor the LX10 had limits:
1) I did the video of my niece's wedding since neither she nor her parents could afford professional photographers (her aunt did the stills). The service went to 35 minutes. If the camera had stopped at 30 minutes, I might have missed one of the key element people want to be recorded before I could start the recording once again (exchange of rings, first kiss, being introduced as man/wife, walking down the aisle).
2) My mother-in-law and her best friend were giving a lecture on Ikebana (Japanese flower arranging) at the Boston Flower Show this year. This was a big deal for her, and she was glad I recorded it. The main talk went for 40 minutes.
3) I record the performers at a small local renaissance faire. Each of the performers are given a 30 minute block. I had several performers that used up their entire time slot with one long show, and in fact ran over by a few minutes (sometimes cutting into the time of the next performer). In addition to the individual performers, there is a finale done each day, and things can vary of how long things go on.
4) In the past, I used the E-P2 and E-5 cameras that had 7 minute limits (for 1080p) or 14 minute limits (for 720p), so I had to be more careful about the time. Even though I've heard and recorded most of these performers many times, every so often they would add an extra verse at the end of a song, and I would miss parts of it as I was turning off and then then turn back on the recording.
5) I record a show put on by a group of friends. The typical run time is 1.5 hours for the show. This group only does one public performance (that I record) of a particular show. Each show is different, and even if they do some of the same songs, like in #4, sometimes they add to the song. So, I have no idea where the cut points are. It is a lot easier to record it as one long take, and then cut it later into different scenes, than to try and guess where the scene ends. And I can eliminate dead time if there is any between acts by making a longer cut. In addition, there is usually an audience participation segment, where they pull people from the audience and that can be variable time.
6) Starting with my niece's wedding, and going on to the shows in #5, I now use my LX10 camera to record the same show on a tripod across the room. Generally, I never use the LX10 footage, but it is useful to have a backup just in case. After I did my niece's wedding where I just put it on the tripod, and controlled it via the phone app, I looked around and I found a wifi pan/tilt head that I can use to change the camera angle. Because the LX10 is a fixed lens camera, I can control the zoom from the phone app. Now my main focus is on the G85 that I control manually, but every so often, I look at the phone to set the focus point, zoom in/out, and use the pan/tilt head. I wouldn't be able to start/stop both cameras at the same time for scene cuts.
I really wish there were more electronic zoom lenses in the micro 4/3rds arsenal than the 4 rather slow and old lenses (Olympus 14-42mm EZ, Olympus 12-50mm EZ, Panasonic 14-42mm PZ, and Panasonic 45-175mm PZ), as it would allow me to use a micro 4/3rds camera remotely and control the zoom (though I'm not sure I would want to put gear costing $1-2k US on a remote tripod, but it would be nice to have the option). I've been meaning to check out cheap wireless follow focus support for the remote zoom.
I have heard that one of the other people wanting long limits, wanted to record an entire concert, and one of his/her concerns was that people were picking up on the dropped frames some cameras have when they split video into 4GB chunks. Now, I may not be able to detect a few missed frames, but evidently some of the musicians can. It appears that Panasonic does not skip frames.
I could imagine a funeral, like a wedding might be time when people run over time limits.