I think Adams has two more top-5 WR seasons left in him before we start see a significant decline. Problem is... Adams wants a lot more than a 2-year contract. ...and I would too if I was in his shoes. Whichever team gives him a long-term deal, they'll deeply regret it on the back half of the deal. Truthfully, I hope Adams plays this year on his Franchise Tag then the Packers let him find another retarded GM to give him a 5-year $150M deal.
If I was building a new team and had my choice of any WRs, Chase would be my #1 WR choice. ...Doesn't matter if it was a 1-year fantasy team or a dynasty team. He's got elite talent with the least amount of mileage and least likelihood of significant injury. I'd let someone else draft Adams on a dynasty team, but I'd definitely have him in my top 5 on a 1-year deal.