I think we all wonder that about you Glaston tbf.
What are the motivations involved in spending your life being antagonistic on a Man United forum (and others by all accounts), and damaging the reputation of your club amongst people who under normal circumstances have a fairly favourable or ambivalent attitude to your club? Truly I don't know. Doesn't it wear you down? Do you have concerned people around you? "Oh look, daddy's on that Man United website again, bashing his keyboard and muttering things about apple carts and winter coming. 7th night this week."
Some of the stuff you're coming out with you know to be garbage. No right-thinking Spurs fan could believe that United fans don't want Leicester to win the league. I feel confident saying that for virtually all of us it would be the best PL season in memory outside of United winning it. I'll certainly toast it personally. To think we'd want City/Chelsea/Arsenal to win it is just mind-boggling and total wilful manipulation of reality. And for the vast majority, Spurs would be the favoured choice over any of those three.
I actually don't think you're wrong that the 'lesser' sides in the league are improving dramatically - it's clearly true. However, the elephant in the room here for you is that Spurs are at just as much threat of being side-lined by these guys as us. 3 or 4 years ago, Spurs only really needed one of the 'big 4' to have a shocker and you could find yourself in the CL (or picking up a league cup). You are part of that establishment, albeit the one most typically on the fringes. Now, not only will you have to continue to contend with those same established clubs, but also the threat of the West Hams, Leicesters, Southamptons, Mosiri-owned Everton etc.
If we should be worried about this (I'm personally not, I relish it and am loving the variation in the league at the moment), then Spurs should be equally if not more so. In a strange way the 'status quo' you like to talk about wasn't working too badly for you, because you were practically part of it, much as you'd be loathe to admit it. You are far from immune from the shifting dynamics of the league.