When deciding where to donate we should consider where our money will do the most good. "Keep Wikipedia online" is a candidate for one of the most important things, if that's actually what your money will help do. But other Wikimedia projects, while useful, are generally nowhere near as high priority, and there are a lot of other places we could be donating!
People may be excited to fund that other work too, but they should make the case for it instead of pretending there's a risk Wikipedia and their other sites will drop off the internet.