If we speaking kinda teoritally.. well, I guess it is possible sometimes.. maybe after all bitcoins would be mined.. and price could be more predictable.. but I'm sure banks will not offer for you very good conditions...
They will earn money for themselves first of all..
agree,I think it's just the matter of time. banks need to consider how fluctuate bitcoin price is so they won't get big loss. Indeed if banks would offer this kind of service , maybe we have to wait until bitcoin itself legal in all over the world.