The MOST important factor for Canon to gain ground in mirrorless world is EF adapter to mirrorless. If they can come up with adapter with decent AF speed, better than current ones on the market, I think that will give Sony, Fuji etc... good run.
Enlighten me on why they need an (EF adaptor to mirrorless) "adaptor to mirrorless with decent AF speed"?
In what way does the current EF-EOS M Mount Adaptor affect "AF speed"? And how would you improve it?
Or are you talking about some other adaptor?
EF-M lenses were designed to mount to EOS-M directly, no adaptor needed.
For Canon shooters, standard EF and L lenses are as good as gold. These lenses can still be used with EOS-M system with an adaptor, however, AF speed becomes slower.
“how would you improve it?” - I leave that to Canon.