Typically what happens in the low-end hosting world is that smaller providers get bought out by larger ones, (though large in this sense might mean a 4-person company with 200-1000 virtual machines gets acquired by a company 2-5 times larger). At that point you'll probably have your stuff running and you'll be "invited" to migrate.

But in short you should always assume your stuff is going to disappear; take (offsite) backups, have (offsite) monitoring, and design applications to cope with rebalancing/relocation/redeployments easily.