I heard that Wikipedia can be downloaded and it would only take 40GB (If there are no images). It may be possible as the poster noted above, to move Wikipedia to a blockchain, but it has its technical challenges. As it stands however, I think the current direction Wikipedia is heading is towards self-sustainability. So, you got to hand it to them as they keep their services running.

The best thing to do really, right now, is to donate to Wikipedia. They need it.