Can't agree with a lot of that.
If reports are to be believed Schneiderlin is on over 100k p/w. Which clubs can afford, never mind be willing, to spunk 8-10M on a transfer fee for him and then give him a 3-4 year contract on 100k p/w. It's pretty much a 25-30M investment on a player who hasn't played his best football since he was at Southampton.
I'd be amazed if any team was willing to pay anything over 3-5M for McCarthy.
I think Niasse could fetch 7-10M. Given regular game time he could be a 1 in 4 or 1 in 3 player for a bottom half Premier League team. He's 28 and relatively low wages. Can see someone taking a punt on him since his record suggest he could grab 5 or 6 league goals between January and May. That can be enough for some teams to survive. Even if they don' he's a relatively low level risk with parachute payments etc..
I think ~15M in total for all 3 players is more realistic. Even that could be pushing things