Wikimedia Foundation has enough assets to keep hosting Wikipedia for the next 60 years, according to their financial reports:
Wikipedia will really be fine. It is all the other expenses that raise eyebrows in a major way. This, of course, includes the pay of the executives and high-ranking officials that earn anywhere between $150k to $500k a year, and their salaries keep growing exponentially. At the same time, they spend donated money hiring union-busting firms - presumably, to crush on the latest unionization attempts and keep growing their pay.
https://meta.wikimedia.org/wiki/Wikimedia_Foundation_salaries