Weirdly this feels like a non-issue. Google has not felt like it has a "personality" for some time - maybe it's a function of hitting mega-corporate size, but it also feels a bit like when Microsoft (a Computer on every Desktop) essentially achieved its goal, it then spent a decade in "goalless and soulless exploitation" mode - something that one suspects is the next step for the worlds largest personality-free platf…
What makes you think they're retiring to sit on their asses all day and "spend their billions"? Maybe they have new and interesting things to do.
Why spend their own money on a risky capital intensive venture when their cash engine let them do it unopposed?