> If a better search engine comes along and people switch over
People are lazy. It's hard to deny that Bing and DDG are "better" in many ways, but how often does that matter? Most searches are simple and mindless - where any search provider will give you good results. Google has optimized for this use case.
> how would you like to pay $10 a month for a GMail and Google Maps combo access package?
Isn't $10/mo slightly above what Google Suite costs, per individual user? I would argue that it's already happening - if Google services are important enough to you that them denying you service would bring serious trouble, you need either Google Suite or to pay for a competitor - either way, providing them a meaningful incentive to keep you around. "Free" services are just not something you should ever rely on.
Same goes for other big service providers like Facebook, Twitter or Amazon's retail service, of course - if you can't even pay for meaningful support, you must have some sort of contingency plan and diversify the stuff you rely on. It didn't used to be like that, but Google and other big Internet properties have matured and lost a lot of their inherent "slack", even as our reliance on them may have increased - and that loss of slack could come back to bite you in the ass.