this is a tough one. i guess your rosters are really small meaning a guy like manngingham getting dropped isn't too shocking. with that said, i still like him. the question is is he worth more than anybody else on your roster.
on a roster this small, i probably wouldn't have 2 TE's. i realize you need somebody to perform in gates' absence, which makes this part difficult.
i wouldn't drop any of your wides over manningham.
i guess the only people i could legitimately see dropping for him would be hass, helu or jacobs.
however, in a league with depth as shallow as this, i doubt you can afford to drop any of them for the future.
so to answer you question, if it were me, i guess i'd prob stand pat. as much as it pains me to say it, you'd be either sacrificing your teams future or killing yourself by not starting a TE for possibly the next week or 2.