I don't think non-viable to viable is exactly what's going on however, at least in most cases. I think the costs are not being fully understood, the impact to the mindshare of the team, the quality of service and redundancy, the additional headcounts and quirky management code that someone's going to be toiling away on when a cloud provider can handle it at a much lower cost.

Yes, you still have to open tickets, and yes, they still have problems that suck up a lot of time, however they spend the brunt of the time burning folks out fixing those issues, not you. If you talk to folks working with physical systems, that consumes their mindshare to the point that they're not focusing on their core product anymore.