When (rational) people make decisions they weigh the possible rewards of success against the possible costs of failure. We are in a situation where the costs are virtually zero ("oh no, we have to try again in 6 months!") while the rewards are immense: the potential to consolidate even more power to the rich and powerful elite.

It shouldn't be surprising that this happens again and again, and they only need to succeed once. Social movements of the past understood this well. They increased the costs to such an extent that they couldn't be ignored.

Look at the movements that brought forth societal change in the past and imitate them. I can't think of one that didn't have an "extremist" wing that was willing to target the decision makers were it hurt: economic output (eg. strikes or sabotage) and violence.