Boogie can't protect the rim, play man defense, or shoot 3's. The NBA has changed to a league where effective big men usually do some of those. He has work ethic and attitude questions; yes they may improve with a new team but it's still a concern. Compare him with the historical hall of fame players whom basically never have those questions and it's a legit reason to be cautious.
He's a legit talent and voted an allstar above Damian. So there is certainly promise. But he's not a for sure fit and there is a lot of risk with bringing him in to be a pillar of a team.
His contract is up in 2018. Yes that sounds like awhile but we wouldn't be able to build a contender this season; so at the earliest we'd target the 2017 playoffs where he would only have one more year left on his contract and he could leave for nothing. LaMarcus got to the second round and the next year a 4th seed but still left for nothing. There's a very real chance Boogie could follow that path. Compare that with a rookie contract player like Vonleh who we can have for 7 more years.
Since the Kings traded away their picks tanking isn't an option; I just don't see them having interest in a Boogie trade. Maybe months into the future if he is playing poorly and the team is such a mess they think they would actually be better on the court with new players coming in. But they would want players with proven production and none of the Blazers except Dame have that.
6 of the 7 best NBA teams are in the west. A number of them will decline in a few seasons. There is no quick fix for the Blazers to contend so we are better off patiently accumulating assets. When we have more valuable assets we can look at consolidation trades or acquiring stars. But we aren't there yet. Trying to rush the process won't be good enough to contend now nor leave us enough upside players to contend later.