It's certainly a worry.I didn't want to bring up whether you lot trust Kenwright to give Martinez the money to spend. However you also have to accept that if you don't think he would give him the money to improve the team, then it's also likely that he'd actually want to sell the player because then clearly money to him would be more important than improving the team.
I think he knows that there would be riots though. Selling Ross and not reinvesting...hell possibly just selling Ross...could well be the match that would see this board off. With Rooney they had an excuse. Don't think they do with Ross. Not unless he runs down his contract and makes it clear that he wants to go.
Selling Barkley or Stones and not seeing the money would see this board run right out of town, I think.