if you want the items in it, yes.
You can always make a non-ROTW character at any time later on to gain access to your expansion shared stash though. it's not just straight up deleted if you only have ROTW characters and no Expansion characters. They just have separate shared stashes.
i see,
so my account will have 2 seperate shared stash, rotw and non.
And so if i wanted to convert an item, i would have to put said item on an individual char and convert or?