Even with having Tate, honestly... I wouldn't do the deal.
I'm a huge Eagles fan and love DeSean but I think he's overrated fantasy wise. Not once last year did he catch more than 7 passes in a game. He only broke 100 yds 4 times...He was held 50 yards & < 7 times.
When it comes to fantasy, especially if this isn't a PPR league, I'd take a #1 RB over a 1A (I call DeSean a 1A b/c Maclin catchesmore passes than him and puts up similar numbers but isn't the home run threat like DJax) WR 99% of the time...there are a few exceptions with some of the big stars in the game.
A lot of projections I've seen for Beanie are > 1100yds & 10TDs....I wouldn't mind having that available off of the bench.