All that BS that Spurs' CL qualification and annual punching has been based on for years.
It's an amazingly dense point of view that everyone knows generally only goes one way in pretty much any walk of life.
I know its 2019 and people now pretend that finishing in the top four and playing in the champions league actually counts for somthing other then making the club money but it doesn't. They don't count as a trophy and they aren't a substitute for success no matter what sky would have you believe. A manager who has had access to that Spurs side for five years and not won a button is a faliure, a total and utter faliure.
Your entire argument presumes that Mourinho will somehow hurt the progress of Spurs long term. How could he realistically hurt them that much? At worst they'd go from a champions league regular that never wins anything to a Europa league regular that never wins anything but with a few trophies in the cabinet.
I wish Liverpool had bottled it like this and got Mourinho in. They'd probably have won a couple of domestic trophies short-term (because they generally win trophies), but he'd have ruined everything Klopp's built there within three years and have them back in the Europa. It'd have been ace. But unfortunately they've stuck with the long-term project and are now European (and probably shortly English) champions. And crucially it's not going to all fall to bits next season because destructive short-termism is not a pre-requisite for success, shockingly.
Your comparison of the RS to Spurs is ludicrous. In Klopp's first few mouths at the club he help them reach a cup final.
In his first full season he got them back into the champions league.
In his second full season he reached a champions league final.
Year three he won the thing and went to the last day for the league.
Thats actual, real success and progress that people can see. Anyone watching from day one could see the difference Klopp was making to them.
Pochettino has reached two cup finals in five years and has never once been a serious contender for the league title in all that time. He came second twice? Yes in season's when they were never going to win the thing because it was a clear one horse race, firstly againt Leicester then againt Chelsea (that club Mourinho supposedly ruined).
Of course short-termism isn't a prerequisite for success. Nor is blind faith in a long term project under a manager who hasn't won a button in five years with a quality spurs side that was capable of so much more then they have delivered.