It's not always about the abillity of a player though. Fabregas wasn't transformed by Mourinho, he was just brought back to playing in conditions that suit him.
Allardyce was talking about Martinez and young managers in general at the start of the week and how there's a willingness to become more tactically flexible as you get older and more experienced. I think it's definitely the case with Pochettino, he has a style of play that he's confident he can get results with and he was brought in to continue that style of play here. Yeah our squad's lost some strength due to the fact that not all players suit how he wants us to play but that's nothing unusual, we didn't go through 2 managers in a season because we wanted to carry on how we were doing. There's no point getting a manager(particularly a young one) in and then getting them to try an implement a system they are unfamiliar with or don't like, Pochettino was sold as seen to the board and I'm sure they wanted to see a continuation of what he had at Southampton rather than trying to get the same results using totally different methods with us.
Stability is definitely what's needed in areas at the club but it's clear without some changes we'd be in danger of going backwards. Whilst it's very difficult to progress upwards from a regular top 6 side there's also a big gap between us and the rest below. Over the years several different clubs have finished top 6 or threatened to challenge the big 4/5 but we're the only ones that have stayed there consistently, Start finishing out of the top 6 and I think we'd be in for a big drop. Everton are probably the closest club to us in terms of regularly challenging the top 5/6 and even they struggle to string 2 good seasons in a row together.
So long as our erstwhile chairman appreciates that to achieve what M.P wants that he will have to put his hand in his pocket.
I still think that some of our players are unsuited to the type of fast pressing game that M.P. seems to want. You have only to look at Burnley's first goal against us the other night. Defence high up the field - simple long hoof downfield - neither CB reacts in time - and we're 1-0 down in no time. We got away with it in that game, we won't always get away with it so easily.

probably on the quiet