Okay, but what's the end point? What's the "evil" destination for Google? When do we know Google has arrived there, if you say reaching that point is inevitable?
I think that even if Google themselves never do anything "evil", by any definition, there still remains this problem of "having very important user data" that you don't want to fall "in the wrong hands". The more data it has about the users, the more other, external, "wrong hands", will want it for reasons other than just to sell you advertising.
Unfortunately, those "wrong hands" will most likely be the government, and not just some hackers or other companies, and Google is relatively powerless against them, if they really want all the users' data.
This is why I think that if Google really cared about us, they'd do their best to at least give the users the option to have their data protected even if it falls into those "wrong hands". We need Google to implement some real encryption and decentralization in its services.
If Google really is powerless against the government, then they should leave it up to us to deal with the government, when that moment arrives, but help make it easy for everyone to protect that data.