If you seriously thought a) that manager would stay forever and b) that set us up to finish top 6 or 7 consistently forever from now on then good luck.
If we finish 9th or 10th this season, that still means 3 out of 4 seasons we've finished top 8 which is pretty consistent.
Or does consistently in your world mean never, ever finish below 7th ever again?
As was said, prepare yourself for a miserable future as a Saints fan if you think that was ever likely.