Starship Troopers 2: Hero of the Federation "fixed" that by removing the satire and actually being a stupid action movie. So stupid they spent all their money on the "Starship Troopers" name, then couldn't actually afford many bugs, despite the entire point of the fight sequences being many, many bugs -- also despite being made by the company that originally made the damn bugs. Which is why they invented a new breed of alien, with the amazing power to mind-control Z-list actors while mainly avoiding cameras!
"Well, lady, you're a presumed-dead trooper recovered from behind alien enemy lines, you've been acting strange ever since, and now you want to get me alone. But I'm a guy in a horror-ish movie and therefore brain-damaged by tit proximity, so, sure!
Starship Troopers 3: Marauder could afford to bring back the original star, but that was due less to an increase of budget and more to significant depreciation in Casper Van Diem. This movie is what the Ghost of Casper Van Diem Future would show to make him change his ways.
"YOU WANT TO HAVE SELF-RESPECT FOREVER!?"