Why not? It's not as if there's another league on the rise. Ligue 1 and the Bundesliga are one-horse races without a single other club that would seriously trouble any of the ten best in Europe. La Liga is very settled and no club is on the way up--on the contrary, Barcelona are in the wilderness and could face a decade of recovery. Serie A is less awful than it was in the last decade but they're still a far cry from their 90s dominance. There's nothing going on in European football right now that could challenge the PL for the imaginary title of Strongest League. Nothing's even slightly close, in fact, and no club outside of England is on any noteworthy upward trajectory.
Meanwhile we have Newcastle who could become the new City in the next handful of years, and United and Arsenal are in a generational slump that must surely end sooner or later. While it's unlikely that the Gunners return as regular title challengers anytime soon, they could certainly become a dark horse that could nick it in a good year like Leicester did. If the Newcastle project works out and if we claw our way back (which is not at all unlikely given our finances), the PL might have five or even six teams that all have a legitimate shot at the title and/or the CL in any given season.
And then you have the likes of Tottenham and Leicester who can seriously trouble any team on a good day, and every season there's a team like this year's West Ham that could very well beat one of the big clubs to CL qualification. That's to say nothing of the bottom half of the PL who are miles ahead of the bottom half of any other league. No other league has anything even remotely close to that, nor is any other league really moving in that direction. The PL continues to rise while the other leagues either stagnate or regress, except Serie A which is very slowly on its way up but doesn't have the financial power to go all the way in this decade. I expect them to hit the ceiling once their two or three best clubs are on par with Atletico.
If anything, it's very much looking like the PL will remain dominant for a long time. Absolutely everything points to it. There's nothing going on that would suggest otherwise. Every year, the gap grows. With Newcastle taken over by oil money and us with nowhere to go but up, I can absolutely see a future where English football blows everything else out of the water. The only other clubs in Europe that can truly be measured against the top English clubs at the moment are Real Madrid, PSG and Bayern, and then Atletico have been there as well but are currently in a lurch. No other clubs than those three or four are on the level of City, Liverpool and Chelsea, and we are only kept from it by poor organizational practices and can bounce right back if that's sorted out.