It Sucks; and it's a really big loss because he is a top player at a key position.
Even though Wallace has played well, this will greatly increase Forbes' snaps; and there is no clear 4th CB, so dept is non-existent ... and ... all that assumes a healthy McDuffie.
All that being said, it's mid-season and the Rams have two starters (Watson and Ford) on season-endng-IR.
That's not good; and certainly not ideal but it's also not extreme either. Teams lose players.
Getting guys like Garrett, Adams, Ferguson and Turner back in a reasonable amount of time could be critical.
The NFL season is a Marathon, and a Battle-of-Attrition.