They'd have to adapt their business models, the likelihood of the services disappearing are minimal because they each have multiple revenue streams beyond just collecting user data. Indeed we know it's possible because much of the list are me-too products from those which have different business models.

Also we don't need a hypothetic situation: Google already kill off a fair chunk of their tools and services, and alternatives rapidly come to fill their place.

Google's position largely exists because loss leaders tied against leveraging network effects – and as others have noted, many of their services are piss poor.

Google's loss won't be Apple's benefit in any meaningful way, the masses are with Google because it's free, and that's precisely what Apple isn't, and there isn't a great overlap in their services.

As a counterpoint I don't think the government's case is the right approach, they should be establishing the rules of the game at the legislative level, everyone needs to be affected by the potential changes, Google didn't form in a vacuum.