*IF* at the end of the year, the Cowboys staff grade out Leary really high, the smart play might be to try to resign Leary, and if they do, then trade Collins for a really good draft pick. *IF* they do not grade Leary high enough or they feel Collins is around or above Leary's level, then the smart play would be to not resign Leary and just go with Collins as the future.
The problem with Leary is that he will benefit from being part of the Cowboys offensive line. Any player from the Cowboys OL would likely be heavily valued in free agency, maybe even over-valued due to supply-and-demand of good OL players. Parnell benefited from this. It will probably come down to how bad Leary wants the money versus how much he likes being part of one of the best, if not the best, OL in the NFL. Given he was benched, not for his play, but because they though another player *could* be better than him, and he wasn't happy about it, I suspect he will take the money and go elsewhere.
That said, I really like Leary though and wish we could keep him, but I won't blame him if he does not return.