This take is so incredibly bad. It's good that they're not struggling financially - and people stopping to donate is a great way to change that. They aren't struggling, until they are. I don't want to live in a world where the foundation behind Wikipedia struggles with financing, so continuing to donate is the only sane way forward.
I mean I would't be surprised if one of the big cloud provider offers them free hosting; it'd be a great goodwill move, and cloud providers are competing HARD with each other.