In terms of the clubs future?
Turned Barkley from a bloke who couldnt get a game for Leeds/Sheff Wed into a regular international.
Put an extra 40M on Stones value
Doubled Lukakus value.
Brought in young players who should go on to be important players for us in the future in the likes of Galloway, Besic, Robles, Holgate, Foulds, Tarashaj as well as setting up the youth sides so that they should be able to integrate into the first team squad easily.
I get having a go at him for poor first team results but to say he has done nothing for the future of the club is just madness. I think he will go and I think whoever takes over will reap the benefits of the stuff he has set in place for the future.
Barkley was a late developer due to a horrendous injury, he would have broken through sooner had it not happened.
Stones - I'd say he's wiped money off his value rather than added to it
Lakaku - Came here because Mirallas talked him into coming here in the first place
As for the players you've listed he's brought through, he's mainly done that because of injury. If anything he's stuck by out of form players and ignored the youth until he had no choice.