Bottom-up is better, of course, and the only way for average citizens to seize power.
But sadly, I hold zero hope for bottom-up agitation to actually work until the Dems are backed further into the corner of irrelevance. The corporate money provides too many lavish lifestyles for establishment Ds to budge from their current oligarch-friendly stance–and Labor for Our Revolution will be blind-sided when Bernie is forced to back a "What’s [Good] for Business is Good for Unions” candidate like Kamala Harris in 2020.
I hope I’m wrong, too.
On a more personal level, I’m getting too old to accept being trapped within binary political options.