Obviously this guy doesn't really know much. The reason IMO articles like this come out is because NFL owners and GMs were so infatuated with what the Rams have in McVay, and for good reason: when you get a guy that young who also happens to be that good, you can see stability and consistency the likes of which have rarely been seen in the NFL.
As far as last season goes....if the Patriots had Russell Wilson and last year's Niners team in their division, there's a few years they probably would have gone 9-7 too.
For the Rams, Niners, and Seahawks, it seems anywhere from a first place to last place finish is in the cards for next year (I can't see the Cardinals winning the division but anywhere from 2-4 seems possible for them).
This guy could be right - the Rams could be in the midst of a rapid decline. But his reasoning is wrong - this was really the only season the Rams would be cap-strapped - and what he fails to point it out is that we somehow have spent nearly $40 million anyways. The contracts handed out this season: Floyd, Robinson, Whitworth - could all come off the books after this season.
We'll continue to see articles like this for the next few years though - being young and better at your job than older people is something this country has always had an issue with.