Will Shadowmourne warrior on Blackrock be deleted?

If i buy Shadowmourne on a Blackrock warrior ... is there a chance that warrior to be deleted someday along with my Shadowmourne bought with coins because of long period of inactivity or something else???

I am asking this because i dont want to buy Shadowmourne with coins on a blackrock warrior character, go AWOL lets say couple of years , comeback just to find my warrior aswell as Shadowmourne is wiped.

---- The argument is, i used to have couple of characters on Blackrock , couple of years back when Blackrock main city was Shattrah City ... I came back few years later all my blackrock chars were deleted and now Blackrock main city is Dalaran...

by donating your account become premium.
As perk your characters can not be deleted for inactivity

In case you lose your warrior, you would get those coins back.