Considering how rarely they implement forum wishes (other then those that are blatantly obvious such as more planes) it would just be a waste of time...
I am not sure that the purpose of this wish list (or any wish list for that matter ) is to get every wish implemented and not fall through the cracks. Some things it might accomplish:
Allow players who have an idea to easily see past suggestions, to review past comments and build on ideas that have been submitted in the past.
Have a place where HTC can say what they want about a suggestion. Over time, I think that this will help build a more informative community.
Give measured feed back to HTC about current issues. As an example; right now some players have been upset about the 12 hour rule. There is a lot talk about it (along with ENY). I think that it would be fair to say that most comments ask that the rule be changed. I like the rule, but I rarely say anything. If there was a voting process that showed that 98% of the players hated the 12 hour rule, HTC would be foolish not to pay attention. The message from players might be: Fine you are trying to solve a problem, figure out some other way to do it, this method sucks.
I remember when HTC only had small maps in rotation, or actually better yet, when they limited the number of players in arenas. I couldn't believe what they had done. I found it even harder to understand why, with a large portion of the user base screaming for change, that nothing seemed to happen. At one point I wondered if this was a Texas thing, piss off your client base and see what happens. I've come to the position, (keyed off of a comment made by I believe one of the HTC guys that they get slammed if they reply and slammed if they don't, so they just don't), that perhaps there is a sense of an encirclement down there in Texas. I know that in the past I have been there myself.