Another change I'd propose is to change the scoring system so that W=3 D=1 L=0. This wouldn't stop the scenario where two players tied for the lead in the last round agree to a quick draw, but it would reduce the number of draws dramatically.
Agreed. Also, the arbiter can take action against those players that are deliberately flaunting the rules by arranged three fold repetition etc. After a game is declared null and void or the players are fined, they will soon alter their behaviour.
The problem is, how do you know that it's pre-arranged? And for me, even if it is, it's called strategy, and the players shouldn't be fined.
Play Armageddon and sudden death until 1 winner. Remove Draw!