If you are price/value conscious then the lack of third party RF lenses should concern you. This Tamron lens fill a hole that Canon has not and likely never will. The same can be said for about every third party lens made. While I am critical of the Northrups on many occasions the video linked below made some excellent points about ramifications regarding what Canon is doing with third party lenses. Then I read through the comments under the video and most are very critical of Canon and not having third party RF lenses is a non starter for many, many of the commenters buying Canon gear going forward.Thats a nice lens but I'd rather have the Canon RF 100-400 for $500 than this for $1300. You pay for the extra 50mm and slightly faster apeture but I don't need those, but do like the smaller size of the Canon, which is roughly half the weight. If you compare it to the RF100-5000 then the Tamron is much cheaper but you lose the the extra 100mm in reach, which I think is more important than 50mm at the wide end.I think in this regard the past predicts the future. Look at any mount and you can see how 3rd party lens makers offer certain lenses that provide what the OEM maker can't, or will not, provide. I can list lens after lens but a good example is the latest 3rd party lens review here on DPR.It depends on what the average user wants. Canon alrady have the lenses I want at a price point that is reasonable in my eyes. That might not suit you, but can always move to another brand if you want to. FYI, I own the rf351.8, rf501.8, rf85f2, rf 24-195f4. I plan on buying the rf 16 f1.8 and the rf 100-400. I'm also interested in the rf 24f2.8 ang the rf600f11. But thats just my wants and is not necessarily reflective of what others want, in the same way as yoir wants are not refle tive of anyone elses.The question is can, or will, Canon provide the variety of lenses users expect at the quality and price points they demand? I don't see where Canon can do this even if they are willing to do it. This will give Sony a huge advantage over them going forward, IMO.Canon introduced EF mount in 1987, it is still selling after 35 years.I don't think this means the end of Canon's imaging division at all. I don't think anyone has claimed this to be true. It could very well mean this decision will stunt the growth of the R system user base, or even shrink it, at a critical point in its existence. It could also bring some very negative, lasting PR to Canon from which it might take a long time to recover.
RF mount was introduced in 2018.
Its patents may filed before 2018, (no later than early 2018) because once a product is introduced to the public, it becomes prior art, and is too late to file patent.
Patents expire 20 years after filing. After 20 years (around 2038 ), everybody can make RF lens according to information disclosed in the patent without paying a dime to Canon.
Canon probably has filed additional patents related to more advanced/improved features of RF mount after 2018, competitors cannot incorporate such features into their lens until those patents also expire though.
Assuming RF mount life is not shorter than EF mount, by 2038 RF mount may be just in its middle life - a boost with 3rd parties lens may be a good timing for Canon
Everyone has there own wants and needs and should choose the system that meets them. For me Canon meets those, for you if it doesn't, move on, switch systems, whatever, its your choice.