I think that EOS 7D's line replacement, while still being an APS-C based, is going to sport R mount, not M one. Interesting times ahead, thoughhehe, i hope they scrapped more than just 1 DSLR in favor of mirrorfree ...
5Ds/R II>> "EOS R5 Pro", hi-rez sensor model (60MP?)
6D II>> "EOS R6" same as R in smaller body, without top LCD and at much lower price
5D V>> "EOS R Mk. II", with decent fps even in Servo-shooting priority AF, decent 4k specs, improved UI/control points
1D-X III>> "EOS 1R" ... 2020 Olympic killer beast leaving "Nikon Z8" and "Sony A10" in the dust
78D, 90D>> "EOS M5 II"
EOS 7D III>> "EOS M7" slightly larger + wheathersealed body, LP-E6N battery, more DIGIC power for more fps and (even) better AF than "M5 II"
"all Rebels xxxD">> "EOS M60" - further improved, same price, successor to M50
"all Rebels xxxD / SL-">> "EOS M 200" - successor to M100
So I'd say all of their DSLRs could, should and hopefully will be scrapped and replaced by mirrorfree cameras.