I don't see this as a "freak" season in any way. But I also think we'll be hard pressed next year to match (or beat) this year's point total.
We've benefited from no major injuries (until Saliba), had a very settled/productive first XI, and pulled some results from very close games. Next year though I think we'll struggle with a shallow bench, challenges related to Europe, and Arteta's (so-far) inability to incorporate our bench players so they come in firing.
No matter how this season ends I'm pretty sure bookies will have Man City as favorites to win the title next year....