If you keep running 0.10.2 then yes, but if Gavin leaves the Core team (it seems he has not actually threatened to leave it, but all this fuss may cause his ejection) and the Core changes to include side chains then those versions of Bitcoin Core will not be compatible with Bitcoin XT and a full fork will occur, which is why I say make a backup of your wallet NOW. It's also more important than ever to check what changes are being made to the client you're using so you know whether or not they cause a fork.