- Cheap to host, just text and images
- Funded by non-profit with too much funding
- All images are permissively licensed
- Easily archived
- Easily forked
The only potential "death" I can ever see happening to Wikipedia is the kind that happens from some kind of fracturing, similar to what we often see with fan wikis. But this kind of outcome could be a good thing really, multiple competing Wikipedia's would probably help keep each other honest, and wouldn't functionally be too different than the non-english sections of Wikipedia that already exist.
If anything I'm a bit concerned that Wikipedia might be getting a bit too influential than an encyclopedia aught to be.