the Going Merry was prooved still alive in chapter 428. But it didn't appear fresh and new again, its patched everywhere. So, whats do you going happen to Going Merry?
-Keep on using the ship until its patched everywhere
-Going Merry would still be active, but its going to be brand new
-Say farewell and get a new ship
-Get a new ship but stick the old merry head on
Personally I quite like sheep thing, nothing an replace that, so they would keep that for sure, but the body should be made into a new ship since its not going to last.