In all honesty, I don't really see the attachment to Martin. Don't get me wrong, as he was a great teammate and has made a few nice plays over his 3 seasons in Green Bay. But lets be honest here, when has he ever been a serious threat to move up the depth chart in our receiving corps? He's always been that solid #5 guy that was always kind of sitting on the roster bubble, but usually still made the team because none of the other young receivers behind him did enough to take his spot.
Martin probably lost his job more than Swain took it from him and I bet dollars to donuts his muffed punt against the Titans was the final straw that broke the camels back. Swain showed improvement over his rookie season, did a decent job returning punts, and even played some emergency CB when we were running out of healthy bodies against the Titans.
After 3+ seasons in Green Bay, Martin really didn't do much in his game to take that next step and pretty much has hit his ceiling as far as what he's capable of doing in the NFL. He probably will have a chance to latch onto another team looking for some help at receiver, but he's probably never going to develop into a starting caliber NFL receiver and will always be a #4 or #5 guy on a team.