It's all semantics, but there is a middle ground between "not shopping Tyrus" and "willing to trade him for a star," just as there is a big difference between "dumping/giving up" on someone and being willing to "move on." I'd be shocked if Tyrus isn't "available," but I'd also be upset if he was simply dumped, traded to merely be removed from the roster. If Tyrus and Kirk can get us an upgrade at PF/C, however, I'd say it's a worthwhile trade.
I'm somewhat bemused by the overwhelming negativity on Tyrus now, as it seems the Bulls fans consensus is that he's now officially a major bust after the playoffs. Last year, I was losing my mind at how blind most fans were to his flaws, but this year it seems that everyone is totally ignoring how strong he looked during a particularly sustained stretch of the season. Three months ago, people were starting to ask IF they'd trade him for a star! Now, that was hogwash, but it's also probably premature to bury his career after looking like junk during the last five games of the playoffs.
Once again, I'd argue that the truth is somewhere in the middle. He had the best year of his career, and showed that the talent is really there, but he also showed that he's not there yet and can still be a mindbogglingly frustrating player (my greatest critique of his game has always been the mental aspect, and while he's shown me he's grown up a touch this past season, he still doesn't really get it). To me, that adds up to someone you're willing to move but not necessarily someone you have to move.