The cluster storage is another temporary solution, but yes we plan to host your videos for much longer than before, but we can't promise that we will store it forever.

Our end goal for storage is to have every file available on IPFS / WebTorrent / DAT for a pretty long amount of time on our servers (which mostly will depend on our budget for infrastructure, something that is hard to foresee today), but we will need our users to use either a desktop or a mobile application running at least one of those 3 techs to keep old and inactive videos online.

Another solution would be to incentivize Steem witnesses to run IPFS nodes and pay them proportionally to their used storage, but I don't see how that'd work.