Nothing would ever be able to be passed or in very rare situations. Imagine how many votes you'd need to pass anything and how innactive most people would be.
Majority vote and no quorum. But that sorta puts debate power in the hands of those who are always active, while some members could mobilize zombies for vote power whenever the mood strikes them. Universalism straight is becoming less and less appealing, but the current compromise being struck in the Convention is a promising starting point.