If the Blazers turned down a trade for Amare that didn't involve B-Roy or Greg Oden, this would have to go down as a massive blunder for Kevin Pritchard.
For example, you know Outlaw/Webster weren't going anywhere in the trade. Same with Blake and Pryzbrilla.
Realistically, the most Phoenix was asking, had to be something like LaMarcus Aldridge, Rudy Fernandez, Jerryd Bayless, and Raef Lafrentz for Amare Stoudemire, Jason Richardson, Louis Amudson, and Matt Barnes.
Yeah, that's a lot to give up talent wise, but you're still left with:
PG-Steve Blake/Sergio Rodriguez
SG-Brandon Roy/Jason Richardson
SF-Jason Richardson/Travis Outlaw/Nicolas Batum
PF-Amare Stoudemire/Michael Ruffin
C- Greg Oden/Joel Pryzbrilla
If you can pair Brandon Roy and Amare Stoudemire, while having a role playing point guard, some fill ins at small forward, and two defensive centers, I think you have to take that shot.
And I'd imagine Phoenix asked for a lot less than the package I posted.