Both Demaryius Thomas and Julius Thomas are entering contract years in 2014 and they want to save money so that they can give them both a contract they can not refuse. Because of that, there is pretty much no chance Decker gets a big contract offer from Denver.
There are several teams in the NFL who need a guy like Decker to become their number 1 option in the pass game and they'll be willing to offer Decker big bucks.
Lets take a look at some of those teams:
New England Patriots - It was a rough year for the Patriots and their passing attack. They lost Aaron Hernandez to murder charges in the off season, Rob Gronkowski tore up his ACL & MCL in December, and the oft injured Danny Amendola might be getting cut as he was on the field for just 48% of New England's offensive plays. The only guy on the Patriots who made an impact in the passing game was wide receiver Julian Edelman, and they might lose him to free agency. Tom Brady needs help and Decker would be a great weapon for him.
New York Jets - The Jets have lacked a talented wide receiver for several years and no team ever fears the Jets passing game. Geno Smith made a ton of mistakes during his rookie season, but it's hard to place the blame solely on the young quarterback. Only 4 Jet players had 30+ catches and one of them was running back Bilal Powell. The other 3 were Jeremy Kerley, David Nelson and Kellen Winslow. Scary. Not. The Jets desperately need a guy like Decker who can give make plays for Geno.
Indianapolis Colts - Yes the Colts already have T.Y. Hilton and Reggie Wayne, but Wayne is 35 and coming off a serious knee injury. Aside from the two of them, the Colts are relying on a lot of unproven young guys like Coby Fleener, LaVon Brazill, and Da'Rick Rogers. Indianapolis will have plenty of cap space to sign Decker and the thought of taking away one of Peyton Manning's top receivers might be more incentive for owner Jim Irsay to sign him.
Carolina Panthers - Steve Smith has been the number 1 receiver in Carolina for the past 11 seasons but he will be 35 by the start of the 2014 season, so it might be time for Carolina to find their next big time receiver. Decker will be just 27 and will help this Panthers passing offense who really lacked play making ability. Adding Decker just makes Cam Newton that much more dangerous.
Clearly it's too early to figure out where he will be playing in 2014, but he's going to be a hot commodity on the open market this off season.