Why?
Dez is a top-3 WR in the league. Beasley is a top-3 slot WR in the league. And they are 27 and 26 years old respectively. They were incredibly productive and dropped the least amount of passes in the league in 2014. Romo went down and Dez got hurt.
Dez and Beasley aren't the problem. And neither is Williams for that matter. It's a matter of having a legitimate QB to go along with a HC and O-Coordinator that can design some plays to make better use of these guys.
YR
I'll give you 4 WRs. You tell me who Dez is better than - Antonio Brown, Julio Jones, DeAndre Hopkins, Odell Beckham.
I'd rather not be the team Dez ages on. He's a mental midget who throws temper tantrums in times of adversity and he relies completely on his athletic ability on the field. Something that will fade over time. Leaving him to be a poor route running head case who can't get open. He's not a guy who will age well.
Beasley is nice in a limited role but very, very limited at that. It's not high on my priority list to replace him but I do believe we can upgrade that position with the right player. Someone with a little more size and speed.
I don't think much of Williams. He's a role player who is easily replaced and hopefully with someone more capable of producing consistently when the #1 is out of the lineup.