> Which kinda defeats the point of saving bandwidth on their side.

Traffic doesn't only need to be served by Wikipedia but could also include other volunteers (think archive.org and others) and the setup for helping out would be easy.

> That could work, though I was under the impressino that the js-ipfs implementation was WIP/Experimental (last I checked)

That is absolutely true, which WikipediaP2P is as well, and IPFS for that matter. I was simply pointing out some ways you can make the whole "Wikipedia on IPFS" thing to work in the future.