I doubt it's too late. There may be a cost to escape, but it may not be insurmountable.

At the height of the cloud hype, we were all more than happy to pay to lift-and-shift our way to higher operating costs. Surely, then, a lift-and-shift toward lower operating costs is comparably feasible.

If anything the barriers are social. At the height of the cloud hype, we all believed we were riding unicorns to the end of a rainbow with a pot of gold waiting for us. When you believe that, of course you want to spare no expense on ensuring you have the fastest unicorn so you can get that pot of gold before anyone else can.

Then it's burn out or golden parachute depending on your socioeconomic status.