Definitely sad news, it definitely sounds like SJ39 has moved on emotionally and is actively hunting a new team. I have to admit at being a little disappointed at his decision though, the only reason seems to be that he doesn't want to share snaps with 2 younger, very different, RBs and I find that a little arrogant - SJ39s only got a couple of years in him, and he's getting slower.
The Rams, or any other franchise, are a team and everyone pulls together to succeed. I remember speaking to Graham Henry (the former Wales and New Zealand Rugby Union coach) about him leaving one of Wales' best players out of the team he said 'One good player won't make a winning team, but if you get a team of players willing to working together that's when you're looking at a winning team.' He used to select groups of players that complimented each other, and it worked. If SJ39 didn't want to be an RB by committee then it's probably better to part company. I'm very surprised at the fact he's gone public with this info...
I said on a post on here a few weeks back, I saw him leaving for a year or 2, then coming back to end his career as a Ram. Good luck SJ39, I hope you get that ring - unless you're opposing the Rams obviously