To be honest i do not see it happening in near future, As previously vcash dev made it clear that poloniex support doesnt respond to any query from the dev's and Poloniex have false ticker for vcash stating its something that vcash dev needs to fix.

If you bought vcash on poloniex to move on bittrex in future then you made the wrong choice. In my opinion they have disabled deposit and withdraw due to huge price conflict between two exchanges otherwise poloniex will left with ZERO vcash to trade.

Another thing, if it was really a wallet issue they would have responded and got it fixed by the dev's of vcash.

You may deny the fact but i feel that trading trend of vcash by the community is also making price difference on poloniex.