To the contrary it will be very good for innovation because it means people will build extensions for other email providers such as Fastmail.
And the optimized JMAP protocol too.
The fact that I am getting voted down proves how absolute the groupthink is... If you work in Google's ecosystem, however, the only possible exit is being bought by Google... Get bought by a competitor and they'll just turn you off.
Why do you get voted down for just suggesting that they do so?