For a fan, the trade has been great so far. We've got 3 wins we wouldn't have otherwise. Those wins alone could well affect our playoff position, & for a fan our playoff position matters -- it can contribute to the season lasting longer; we all want that.
Moreover, I just looked at my bank accounts, & I can see no way in which retaining Bojan, going into the luxury tax, no matter how much it costs, will have any effect on those accounts. For that reason, you bet, I'm all for it! Spend that money, Ted -- &, hey, if it doesn't work out... no problem! I'm still good!
Then again, entering luxury tax territory -- even by a dollar -- costs Ted both the tax itself (some millions of $$) & his portion of the distribution from other teams' luxury tax payments (again that's some millions of $$). In effect, those costs could be thought of as connected to the salary we pay Bojan, right?
Now... if he establishes himself as a player at the level of his first 200 minutes w/ us, he might be worth it! Depending of course on what that results in by way of offers this off-season. But... I hope there aren't a lot fans counting on him playing at superstar level through the rest of his career -- that might be asking a bit much of the guy!

So, I'm in the "lets enjoy this while it lasts" mode that SFAM suggests. Worry about the rest of it later!