Arsenal fans loved Wenger because he was an excellent manager. If Spurs fans love Poch it is for the same reasons, there is little wrong with that.
Mourinho, Ferguson, Redknapp et al would say all kind of things in interviews that could mean something or nothing. I would hope that worrying, and possibly being peed off with Pochs chat, does not sour the ongoing positives of recent seasons, because, obviously he will be gone one day and it'll be a shame if it all passed by and you haven't lived in the moment. From other quotes you could easily say that it sounds like Levy will be the one who tells him they day he will be leaving.
Its all chat, and fwiw I do think Poch is a bit more open and honest than many managers, but he actually comes across as being very open in his mindset, constantly saying 'everything is open' 'all options are possible' etc (not just on the departing subject).
If we are progressing to the next chapter I see no reason he will leave, he never comes across as a 2/3 season manager, he's a football romantic. As long as the club are pushing the upward curve as well, Poch will lead the way.