I'm sorry, when did I say 'every mirrorless camera has to be smaller'? I'm saying there are (principally) two camps of form factor devotees here -- people who care about it being smaller and those that don't.
Let's say Canon had market data that said that:
40% of folks will not touch FF mirrorless unless it has a thin mount.
20% of folks who don't care about mount and are simply interested in FF mirrorless in general
40% of folks will not touch FF mirrorless unless it has a full EF mount.
All of this forum's lengthy, correct, practical statements (about size savings being meaningless when you think about FF lenses, why adaptors are a pain, that all the current EF users will be bummed, etc.) will be true,
but Canon will still be out in the cold for 40% of the market.
Some feature-based A or B decisions are so difficult to call that the 'or' becomes an 'and'. I contend that this is absolutely one of those decisions, and that Canon is big enough and ambitious enough to make that 'and' a reality.
- A