Apps is used internally at Google, as I understand it. That's where many of its component applications were first used -- a real case of dogfooding (and/or commercializing what you're already doing, à la AWS, for example).

They recently whacked multiple child accounts for what was Apps Standard / "free".

They also have long term contracts, e.g. with the GSA.

Maybe they'll tighten the screws on commercial Apps accounts/availability, but I don't really see Apps going away anytime soon.

Which isn't to say one shouldn't back up, and be prepared.