Evidence? Where is it?

Well, Android actually has a pretty good architecture for data&apps, so in case of a catastrophic failure it should be easy to reset phone to factory settings. Also, there'll be lot less components than in a common Linux distribution (which can be stable, my Debian installation on a bunch of servers has been living without problems through 2 stable Debian revisions).

But the fact that Android is monolithic is already starting to take its toll. Vendors aren't going to be able to keep up with all the changes (and they little motivation to do this). So separating Android into a set of 'core' components and vendor-specific additions (aka 'crap') should do wonders.

Ongoing work on standardization in the ARM space should also help this.