I don’t think this is a guarantee.
I think it’s entirely plausible (actually I think it’s likely) that after losing a few to us, they’ll lose a few to Liverpool and then either us or Chelsea will come back to the fore and they’ll lose a few to them too and they end this era with half a dozen 2nd and 3rd places without ever getting over the line.
I’m just not convinced Arteta is good enough, or that the players they’re buying are quite good enough to carry the rest over the line. When we were winning titles you could point to 4/5 of our starters and say they were the best in their position in the league - Haaland, KDB, Rodri, Walker. With Liverpool they could say the same about Van Dijk, Salah, Robertson, Alisson.
Looking at Arsenal I don’t think any of their players are the best in their positions - maybe Saliba.