The other thing I'd add is cloud agnosticism doesn't scale. If everyone were prepared for it, there wouldn't be enough elastic capacity with other cloud provide

The other thing I'd add is cloud agnosticism doesn't scale. If everyone were prepared for it, there wouldn't be enough elastic capacity with other cloud providers. You'd need enough reserved capacity in another cloud to pull it off, but I guarantee you finance will say "no." What makes the most sense is multi-region work since it's more cost effective, and it's the more likely failure scenario.