I think its waiting until the "real" Canon mirrorless comes out because this sure aint it.I might be finally jumping ship as well. But I've waited a long time at this point and will definitely give them the benefit of the doubt and wait for independent reviews.. and the full release so we can know the official 100% spec list.
This is clearly not a serious competitor to either the Sony A7III or the A7RIII.
Its a step in the right direction but a bitter disappointment for many of us.
In order to be persuaded to move to a new mount and invest in whole new set of lenses, I would want to see firm evidence of a proper competitor to Sony first.
a) A camera which is truly aesthetically attractive and balanced when using a 20-700 f2.8 or similar - something like the 5D would be ideal. The EOS R doesn't hold a candle to the 5D in my view on this count.
b) Eye focus and IBIS
c) A high resolution option. Personally I don't often want high resolution but there are times when it is utterly wonderful.