The Rams historically have never paid their LBs since McVay arrived and made due with Cory Littleton, who actually was quite solid for us, and have been basically patching it together ever since.
Maybe the offer on the table is far below what he feels is his fair market value, he got insulted, and wants out.
Either way, he is a good player, but not near good enough to be demanding a trade at this time of year IMO. Tons of players every year hit free agency. News flash - they tend to be of Jones' calibre (or lower).
The Rams are a "Me not We" franchise. It will be a big blow at LBer if we lose Jones but I won't lose sleep over it either because I suspect the Rams will survive it between a combo of next man up, scheming around the weakness, and their strong pro scouting department if we go external for reinforcement at the position.