I think Jackson's time will be now.
Whether Jackson is on the bench and Noteboom is starting, or vice versa, the salary impact remains the same.
However.... LTs are valuable. And I suspect the Rams could get as much as a mid-round pick for Noteboom (I just don't know the cap implications of a trade).
Plus, Noteboom has a pretty suspect injury history. So, to me, he's the ideal swing Tackle.
Jackson is a nasty, physical player. He'll be better immediately in the run game than Noteboom, and probably with a little more experience at least as good in pass pro.
I guess we'll know pretty soon.