Doesn't need to be a fact.
On (1), hard pressing sides that are more tactically sophisticated and have better plans to transition the ball are already becoming a norm. What we're doing was once derided as "City lite". But now with the excellent results from our recipe of tactical rigour, academy talents, astute signings and an emphasis on youth and a wholesome culture, we're going to see imitators. They won't do as well with it, but it'll be a league of ever more resilient and dangerous lesser clubs.
Regarding (2), I think it is likely United will settle and become more consistent if Ten Hag gets the summer to keep altering their squad. Chelsea and Liverpool will improve from halfway down the table. Newcastle are highly likely to improve. I also think Spurs and City will fall away slightly. Overall, however, the door has been open this season. We're six wins (ish) clear of third place 75% into the season. I don't see it being repeated.
Same for (3). Our approach is consistent but also there have been some anomalous moments and great winning runs this season that may not be repeated.
And finally (4). Posted about it already but I'm convinced there's a broad spectrum boost from winning the league right here, right now. The narrative about us will only sound like it does now once. If we lose now and challenge again next season, the storyline will be "can Arteta's bottlers finally step up?" That's very different from the current fairytale trajectory, and it has an impact—on the players, on the momentum, on the fans, on the feeling.
None of the above predictions are guaranteed, but I'd say there's more good sense in them than in their opposites, or in a blind certainty we will have a good long time to see if we can think about converting our hard work to glory. I'd say if we don't win this year, we likely won't be in this good a position in one year's time, despite our solid foundations. We may still be in the mix … we may not. Carpe diem.