Zach Ertz for Dez Bryant?

I was just offered this deal in my 12 team full ppr league and im highly tempted to take it, but it scares me that I would be left with a waiver pickup for a starting te (most likely watson, Fleener, Engram, of Ebron).

Is the downgrade from te worth the upgrade at wr? currently my wideouts are Jordy Nelson, Diggs, Parker, Garcon, Amendola, and Hurns

I feel like you have a very good core of receivers. I would almost value Ertz higher due to the fact your not in real need of a better receiver