Not sure why you're so fixated on the concept of motion blur ruining shots.
Actually I'm not. Quite the opposite. Both freezing motion and smoothing motion allow for plenty creative possibilities.
The important thing is to get the background/architectural elements sharp, and IBIS will help do that. If I'm walking around at night or out at a bar with friends I'm happy to get some motion conveyed in my photos via blur. All the better that I don't need to haul around a tripod.
IS will never be able to replace a tripod. It will only help you in a very narrow problem scope. If you can get 2 stops of shake reduction (which is
very optimistic, typically IBIS will more likely get you only a half or 1 stop), you will be able to shoot at 1/10s of a second instead of 1/40s (taking the 20mm f1.7 for example) and still get the scenery sharp while the people are inrecognizably blurred (unless of course the can stand more still than you can hold your camera

). In that case IS helped you. Also if you want the motion effect and would have needed to shoot at ISO 800 to get the scenery sharp, you will be able to switch down to ISO 400 and and get a less noisy shot with even more motion blur and the scenery still sharp.
That's what I consider an ususual scenario though. When taking pictures of your friends your want to have them sharp not the scenery; at least I do. When doing scenery or architectural shots at low light you really want to use a tripod (or a stable ground), again IS
off in that case(!), and the lowest possible ISO instead of handholding at high ISOs.
I don't think this picture (not mine) loses any points due to motion blue.
Nope, it's a good one. However I very much doubt that this is shot handheld, this looks like a several second tripod/stabilized ground (i.e. with IS
off ) exposure or even a multiple exposure using a short and a long shutter time. Mind you I find the different DOF on the left and the right side a little bit "unusual"...
Again: I'm not denying there might be some cases where IS helps, but the use with wide-ish angle lenses is not by far as much as the OP hopes it to be (with wide-ish angle lenses), so in my humble opinion it can't be the only decision criterion and if it was, the E-PL1 is the wrong camera in that case, the OP would be better be off getting an E-P2 since it doesn't have castrated IBIS (somehow I sense a discussion about built-in flash and autofocus light coming up).
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Servus, Daniel