The answer is not to get rid of the convention. Every organization in the world has a convention. Certainly, the two main political parties of the US should have theirs. The real value, since they do no nominating anymore, is that they allow the parties to present their cases (platforms?) with whatever semblance of intelligence that they want to, moreso than can be done in a 30 second attack ad with a little peace of not having the other party around. So the real question is how to effectively get this information out such that the networks will want to present it and the people will want to watch it.