Actually it should definitely be the case that a line crazy proposal can be put up by an independent politician, who backs it with the votes they won. If other politicians oppose it, then they can spend their votes/power on defeating it. But of course if they spend all their votes on defeating things then they get nothing done. So so small initiatives would be able to get through, that currently cannot because there is currently no cost to politician opposing things.

Expendable power is the idea, not unlimited power, which is what we have now.