The Portland Trail Blazers aren't looking to trade LaMarcus Aldridge, as has been made clear throughout a summer filled with trade rumors and speculation centering around the big man. However, that doesn't mean they'd plug their ears and sing loudly if the right deal emerges.
A midseason trade is also a strong possibility, as explained by Grantland's Zach Lowe:
The easy suggestion in the event of stagnation would be to trade Aldridge a year before his pending free agency becomes a crisis, as Utah did with Deron Williams. But that will be tricky. Allen's aversion to rebuilding is real, and some of the asset-rich teams that would make for natural Aldridge trade partners aren't trying to win this season. Aldridge is too good for a Jrue Holiday–style deal that brings only future picks. The Blazers also lack a bad salary they'd be anxious to dump, making the construction of mega-offers less palatable.
We've seen situations like that pop up throughout NBA history, as it's better to get something for a star before he leaves in free agency and prevents you from gaining any assets other than cap space that can't be used on a similar-level player due to the newfound unappealing nature of the destination.
It happened with Deron Williams, as mentioned by Lowe, and it's not too dissimilar to the Carmelo Anthony situation a few years back with the Denver Nuggets.
There's no guarantee Portland is non-competitive enough to make this a more realistic possibility, but the deals are out there if Rip City falters at the beginning of the 2013-14 season.