City and Chelsea can afford to lose Millions and can let Tevez rot in the reserves. Teams like Arsenal, Spurs, and United can hardly lose players worth 10's of Millions on a Bosman. The reality is both Arsenal and Spurs will have to sell or break their wage structures and pay both obscene amounts of money if they want to keep Nasri and Modric. The remaining terms of their contracts are worthless to their respective clubs (in the real world).
As far as Modric and Spurs are concerned, your comments don't hold water.
First of all, a Bosman situation doesn't remotely apply to Modric. Secondly, it's not a question of Spurs increasing (or not) Modric's wages, it's a question of Levy being determined to break so-called "player power" at Spurs - so that never again will a player at Spurs believe they can dictate to the club or leave whenever the fancy takes them. I believe that Levy is ready to show Modric, if necessary, that the club can do a lot more damage to him than Modric can do to the club.
Thirdly, If Spurs chose to bench Modric for the entire season, he would still have 4 years left on his contract and would still be saleable for a lot more money than we paid for him.
Far from Modric's remaining term contract being "worthless ... in the real world", it is a legally-binding contract containing a great deal of power. If Levy says "you stay" then there is feck all that Modric can do about it. At
worst he can refuse to play, but then he'd not receive any wages and would languish at home watching football on TV whilst the world moves on without him.
Spurs are not so poverty-stricken that they need to sell or can't afford to write off a few millions in terms of what they could get for Modric now as compared to what they might get for Modric in a year from now. Nor is the club so poverty-stricken in terms of squad-depth that they couldn't, if push comes to shove, afford to bench Modric for as long as they want: Sandro and Huddlestone in CM would be far from terrible, even assuming no incoming CM signings this summer.
I'm sure Levy knows that the situation is damaging to Spurs whatever happens, But IMO he has concluded - rightly in my view - that the damage will be greater in the long-term if he sells now, with potentially endless future repeats of similar situations (as per Berbatov).
Modric is a fecking idiot for behaving in the way he has. He's chosen the wrong time and the wrong chairman to play silly buggers. It's up to him now: if he doesn't backdown gracefully and do his best at Spurs this season, then he'll get squashed. Either way, he won't be sold this summer.