Nothing, to be sure. But at the same time, nothing prevents someone from creating fifty users on the forum to vote for their favored choice (unless there is that I don't know about...). With such an open system, the results to the poll could be swayed if someone was determined. (I guess what I'm saying is that my own point is moot).
Dovahn
EDIT: I reread the specifications, and I must misunderstand this:
Once the list is complete, it will be submitted as a standard Council Proposal, requiring 20% vote.
If the 20% is not made, the proposal will fall under a Council vote, with Trylon, Pryftan and Bad voting as acting Councilors.
It seems as though it's saying, if the people chosen by Trylon, Pryftan, and Bad are not voted in, then Trylon, Pryftan and Bad will vote on whether they are accepted. This makes no sense to me (because obviously they would vote yes), so I must be missing something.
EDIT 2: Or wait, does 20% mean 20% of the total number of forum members vote? Or 20% of the voters have to vote in favor of them?