When you say 'we can do without him', and his disappearance from the first team's starting eleven coincides with a humiliating slide down the table, defeat after defeat and certain relegation, it really makes me wonder what you think we're doing so well.
Of course I'm not saying that Yeates would have arrested the slide. I don't happen to think he is a great player. He was certainly not as good as Cotterill. I do remember him playing well under Speed. I'm not sure how much of a 'hinderance' his goal at Hull was, but seeing as you think we are doing fine without him maybe to you it was.
Riise isn't our player and never will be, so if you're pinning hopes on him don't count on it or it'll break your heart. If you aren't though, and you recognise that he'll be playing for someone else in a higher league than us next season, then all you're doing is drawing a comparison between a Yeates and better player than him. Well yes, there are lots of good wingers in the leagues above us.
I'm no particular fan of Yeates (he isn't even that fast), but he is an actual wide player and he tries to take people on and get balls into the box. What's depressing is how people are fine with the only recognised winger on the books being drummed out of the club for no reason.