As much credit that is given to McVay, Snead is the real reason the Rams continue to be successful.
Look at the Cardinals vs. Rams. The Cardinals drop a high pick on Zaven Collins, a nice ILB prospect. He goes on to barely play all year, and while he looked pretty good, the Rams draft Ernest Jones later and he plays significantly more. I would rather have Zaven Collins, but the Rams have basically parlayed those first rounders into Jalen Ramsey and Matt Stafford while the Cardinals have a nice ILB prospect sitting on the bench.
I think the piper will have to be paid at some point and that the constant churning of the roster will impact the Rams at some point, but not a major fall off like some fans are predicting.