I dont think wages will need to be on par for most players to be content, just in the ballpark which they are not atm. Sure you have those mercenary players like say an Adebayor, but for the most part a lot of players will be more concerned about CL qualification and content with that if the wages are close. But what was the rumour? 200 000 a week for Kane? I think he will be fine with that, id be more worried if I was a Spurs fan about missing out on CL 2 years in a row. Then I think you would see Kane looking to move, I would imagine he would give them a year to get back in. After that though.....
As for losing players they don't necessarily want to lose Alderweireld, Rose and Eriksen are the three id imagine will move on. But Spurs will be very well compensated, if Eriksen moves it's going to be for a massive fee. And you can't tell me big clubs are not interested, he is class. You would imagine Levy will try and squeeze the most out of the Alderweireld and Rose deals.
Plus they will probably move on players that just havnt stepped up, Sissoko, N'koudu, Aurier, Lamela, Janssen(LOL) being the ones that spring to mind. Spurs could head into the xfer window with a lot of spending money if all those players move on.