Firstly, I'd make sure that 'clamoring' was clearly spelled out as a deal breaker.
Good luck with that.
Secondly, what offense would have a "4th receiver" anything close to that level? Who would he be displacing?
It's not about who he'd be replacing.
The risk/reward analysis is a net negative. There simply isn't enough possibility that we would use him nearly enough to offset the extreme likelihood that he would cause an unwanted and unneeded distraction.
He is a talented player but he certainly didn't appear to have chemistry with Dak and it's pretty clear he did what he wanted with routes and wasn't the most studious purveyor of the playbook.
On top of that he butted heads with coaches and could cause a rift where there wouldn't have been.
Assuming Cobb returns, there's already a top 3 corps here that is much better than most teams can muster.
Given the baggage and given it's already a very strong group without him, why in the world would anyone want him back? If the exact same player with the exact same personality and place in his career played for, say, Buffalo his entire career...would you think it was at all desirable to add him as a 4th WR in Dallas in 2020?
If we were at the point we starter 2018 with, an unknown midround rookie, a washed up has been, and 2 never-weres as our receiving corps, I'd be open to it. Not now.