So look at this:
PG: Chris Paul / Eric Bledsoe / Chauncey Billips / Maalik Wayns
SF: Caron Butler / Matt Barnes / Grant Hill / DaJuan Summers
SG: Jamal Crawford / Willie Green
Grant Hill just retired, too. So now they will have just Matt Barnes and DaJuan Summers at the 3 in order to strengthen their SG spot? And neither CP3 nor Chauncey can handle a ton of minutes anymore (CP3 - 33, Chauncey - 19 last season), so if one of them goes down, the other one will just wear out.
And if this trade doesn't happen, then Bledsoe will destroy their cap or he will just walk for nothing. This is perfect for the Celtics 2015 pick!