What if Kang comes out and clogs up shelves to the point where DST has to cancel the Marvel minimates line? It seems likely
That set did have Thor, and a Thor movie had just come out. Comic-con sets aren't just targeted at hardcore Minimate collectors, they're targeted at non-Minimate-buying comic fans, and even attendees who don't read a lot of comics. So you need an A-lister. Kang, Falcon, Winter Soldier and Zemo are high Bs (most, if not all villains are Bs), and while I love Commander Rogers, if he's not Cap, he's not Cap. Not saying we won't make those characters, just not THAT box set.
So you're saying you'll never make a Wrecking Crew boxset