Maybe longer still... I could see Google fully jettisoning the "other" phone makers and going all in on its own hardware to boost profits further. The iPhone is highly profitable, wouldn't you as a Google share holder want them to maximize the value there?
Personally I gave up on Android years ago. It was never great, but the endless poor support of software updates (mostly stemming from Qualcomm blobs as I understand it) was enough to drive me away. Apple really does support iPhone's for a very long time, and their sole goal isn't to sell more eyeballs. Good enough reason for me.
Imitation is the sincerest form of flattery! This might give them more credibility.
Anyway, I think we're a half decade past where android source has been worth stealing: China now has strong domestic competition.