We can and do consolidate sticky threads occasionally. Others get their sticky bit retired after a while.
The issue, really, is one of psychology, and the realities of how people read and pay attention. Edits, amendments, and follow-up posts on a single or small set of sticky threads tend not to achieve the level of awareness of a combination of separate posts.
But like I said, we are looking at consolidation here and there where we can manage it, and beyond that I've recently increased the number of topics that get listed per page of a board which should at least address some of the "there are more stickies than non stickies" part of things.
That said, I wouldn't expect us to treat this as a super high priority issue in general. A mild annoyance that can be addressed by 0.1 seconds of scrolling or a simple keystroke (the page down button) ends up seeming less important when stacked next to misbehavior, policy, and site software issues.
