Amendola fits what we need, but it's worth noting that he's incredibly injury prone. He's only had 9 starts in the last two years combined. He's also a career 8.8 yards per catch player, which is very, very low. Amendola might be an upgrade over Baldwin, but not by much. They are similar players.
Lots of good FA options this offseason. Personally, I'd give Tony Gonzalez a call and see if he has one more season in him. Sounds like he might retire, but if not he's still got gas in the tank. He'd be an ideal fit for Seattle's short term TE situation.