Probably, just my opinion, because there are already very good options for the 300 and 500 mm lengths with the EF lenses and adapters. My 500 f/4 II works just as well on my R5 as it did on the 5D IV, in terms of optical performance, and that is very good. People transitioning from the EF to the RF mount have no issue adapting the Canon big lenses to their RF bodies.Indeed, one would expect with a pro sports body (R3) Canon would be rapidly filling out the telephoto lineup. A modern 300 or 500/4.5 would pair nicely with the lightweight R3.
I think that when they do replace the 300/2.8 and 500/4, it will be akin to how they replaced the 400 and 600 II with the Mk III versions - lighter, better weight distribution, and updated optical performance. But it's hard to improve on something that is already top notch.
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