Figshare is mirrored by several universities in the CLOCKSS scheme:

http://figshare.com/blog/Ensuring%20persistence%20on%20figsh...

Twelve research universities keep copies of all the data and will make it publicly available should Figshare implode.

Other data repositories, like Dryad, do the same thing, and grant agencies with data deposition requirements usually require you to deposit data somewhere that has a long-term plan to ensure access.

So as long as the twelve universities manage to update all the DOIs to point at the new locations, Figshare DOIs should be reliable.

Yes, I don't trust either figshare or github to be here in 10 years (there was a time when I thought sourceforge would be around for ever, now I keep expecting to see it disappear any day now).