Problem is where it is branched. I don't think they will be able to keep up well. Plus, the new MongoDB storage engine (wire tiger) takes care of its biggest

Problem is where it is branched. I don't think they will be able to keep up well. Plus, the new MongoDB storage engine (wire tiger) takes care of its biggest issue which Toku addresses. Plus, I think you'll be able to just buy Toku's storage engine if you want it when they make it pluggable with the new MonogDB storage engine API.