I think you are over exagerating the need for squad recycling the problem we have is that we ran a small group of players into the ground and we have not replaced any players that we have sold or have got too old. Look at Liverpool they still play a pressing style with an ageing team .
Leeds probably play this football the most and they have a sub 25 year old squad.
Liverpool have adapted it to some degree to utilise some of the older players.
I can't see who in our squad could work hard for 90 minutes as well as be good. IE, some of the kids probably could spend 90 minutes chasing everything, but are they good enough to play 90 minutes?
The good ones will burn out after 60. Sons been doing that since he arrived at Spurs