I'm not going on a whole lot here but this is what Rotoworld has to say:
Trotter points to Johnson's age (28 in November), 2006 workload (416 carries), and running style as reasons Kansas City won't meet L.J.'s reported asking price of $80 million over eight years. It looks like Johnson will play out this season, then test the free agent waters in 2008. If the Chiefs don't use the franchise tag on him.
Interesting little snippet. This is actually the situation I think will happen. LJ will play this year then test the market. I don't think he feels he need to rock the boat that much this year.