I think if he'd died while Biden was in office the sudden drop in momentum could have sunk the movement. Now that the election is past, I think that's much less likely simply because the system has been so thoroughly rotted from the inside. So many people have been fired or otherwise removed from the picture. There is hardly a corner of the government now that doesn't have an infestation in the walls. We learned in his first term how much was riding on norms and humans in various long term roles that simply kept this train moving. Now all that has been completely compromised, and there are many fewer people who even knew the norms, much less are willing to fight to bring them back.
Like, even if we have fair elections again, good luck removing guys like Stephen fucking Miller from Washington now. They're dug in like ticks.
(all that said, I'm still hoping to outlive that fucker)