I've noticed that votekicks generally are used against two types of people - griefers and aimbots. I've encountered more griefers than aimbots though, and getting them kicked can be insanely difficult, because people are used to ignoring votekicks, because they rarely work, because people are used to ignoring votekicks, etc. etc. etc.
It may be too late to break this cyclic behaviour, but the voting system can be improved to work with fewer votes.
I'd like to propose a system where votes against team members have twice (or 1.5x, or however balances best) the value. This means that a votekick can succeed against a griefer, even if members from the opposing team do not vote.
Please note that this system would work better against griefers, but wouldn't effect the chance of successfully kicking an aimbotter.