If we haven't had races and classes added to the store since WOTLK, we won't have them. Yes, people were saying that shit back then, and here we are now, a decade later and they've even discontinued Transmog items from the store because they were a failure.
If they stopped the sub business model, I'd be worried though.
That being said, it'd be funny as hell to see them try. The salt could be used to fuel McDonald's for aeons to come (yes, I'd generate it too).
- - - Updated - - -
Wishful thinking on their end. Rather pathetic, but that's ex-partner syndrome in a nutshell.
They've only been saying it for 12+ years at this point, one day they might be right! Not whilst the game is still hugely profitable, but someday. Maybe. Look at the MMORPGs still around despite never reaching an iota of WoW's success.