Or Chelsea, City, Dortmund, Juventus, Atletico, PSG, Bayern...
Seems strange to suggest Real Madrid are his only suitor when there are at least 10 more prestigious clubs and the average tenure of a manager is probably somewhere around the 2 year mark. Add into this the fact that finances are heavily restricted (they've spent a net of £0 in 5 years, which I'm sure will somewhat continue). I know managers often request more funds if team performances start to drop; if those funds aren't there he could easily resign to avoid his reputation being harmed.
I can easily see a situation where Spurs' performances dip for a period of time. They are heavily reliant on 3-4 players whereby a long term injury or two would devastate them; they have a very thin squad; they have a young squad who're naturally more prone to dips in form; they play a style of Football that is physically demanding; they're moving to a new pitch/stadium; they don't have the the finances to heavily invest. If this dip happens it would be normal for Pochettino to look to the transfer market. I think something which has been overlooked is Pochettino's reliance on selling fringe players and reducing Spurs' squad size in order to bring money in to finance purchases. He sold fringe players who weren't good enough for c.£115m (Noughton £5m, Sandro £6m, Falque £5m, Chiriches £4.5m, Dawson £3.5m, Livermore £8m, Townsend £12m, Lennon £4.5m, Soldado £10m, Kaboul £3m, Capoue £7m, Holtby £4.5m, Paulinho £9m, Mason £10m, Pritchard £8m & Chadli £13m).
This allowed him to buy Alli £5m, Dier £4m, Son £22m, Alderwiereld £11.5m, Wimmer £4.5m, Tripper £3.5m, Sissoko £30m, Janssen £17m, Wanyama £11m, N'koudo £11m, N'Jie £12m. Obviously that's a fantastic job in increasing the quality of the squad without having to spend anything out of the club coffers. However where does he go from here; if the money isn't available and he can't balance the books by selling squad players, he may end up at odds with the board.
You look at their squad now and I can't see where they are going to raise anything like this level of funds required to keep the squad fresh. You also look at the drop off in quality after their first XI and see it requiring serious improvement (United's bench vs West Ham was Mata, Martial, Smalling, Rashford, Fellaini, Young whereas Spurs' vs Chelsea was Son, Sissoko, Trippier, Wimmer, Winks, Davies).
Do Spurs fans believe this is a worry? Who will be sold this Summer and will the transfer budget then to sufficient for Pochettino to stay happy? I'd guess the likes of N'jie, Bentaleb, Fazio, Carroll etc will leave?