I still have the feeling of being left behind with my 6D and my EF lenses exactly as I was in '87 with my AE1-P and my FD lenses.
I understand the need for leap jumping but damn, I hate adaptors. An how about my planned investment in a 24-70 f/2.8 II L and the 135 f/2.0 L ? Will I do that now? Probably not. Or maybe by some used ones.
My guess is, that with this launch Canon is going all in on EOS-R, and we will probably see a lot more new RF mount cameras. I will be surprised if we will ever see an 7D or a 6D mkIII. We will might see a new 5D and 1D, but that will be it. The rest will RF cameras.
I will probably keep my beloved 6D until it is totally worn out, and then buy a RF mount camera, and RF 2.0 or 2.8 "standard-zoom" and a few primes, and the reuse my old EF lenses - maybe even buy some extra adaptors to be fixed on the most used lenses.
Canon is probably doing the right thing with the RF mount - I just have to take it in.....