I actually agree with all this talk about big money wide receivers. And I think there's a possibility that Mike Wallace and Dwayne Bowe became examples 1a and 1b of the danger involved in signing a free agent wide receiver to a big money deal.
But I see Greg Jennings as an EXCEPTION, for a couple of reasons:
1. He's being unfairly discounted for injuries which are not long term damaging
2. He's 29 years old but people are discounting him as if he's 33 years old
3. He knows the system and "grew up" in Joe Philbin's offense, this is a factor not to be understated
4. Brian Hartline is a free agent, putting Miami in position of needing to sign a free agent, even if just to re-sign Hartline
5. There's a strong chance the amount you pay a Greg Jennings is only marginally (~2 mil/yr) more than Hartline
Given all those things, yes I do consider a Hartline-for-Jennings swap to be a worthwhile upgrade. If Brian Hartline is demanding $6 million a year and you are seriously considering paying it, why in holy hell would people not consider paying Greg Jennings $8 million a year instead?
But then, maybe you shouldn't be considering EITHER. Maybe the Dolphins should say goodbye to both Hartline at $6 million a year, and Jennings at $8 million a year. That at least makes a hell of a lot more sense to me than paying Hartline $6 million a year where Jennings may be able to be had for $8 million.