You're right, and it's only a sliver of hope, but the history of Prop 8 shows us that courts can overturn propositions (Prop 8 banned gay marriage in CA but was overturned in district court on due process and equal protection grounds). I recognize that Prop 8 and Prop 22 are not the same, but there are valid equal protection and due process arguments against Prop 22.
tl;dr: It's a long-shot, but it ain't over till it's over
cum_on_jack is correct that this CA case can't be used to affect worker classification law on a national level/go to the SC--but @piss you're right that it's highly likely Uber and Lyft will use the prop 22 strategy in other states , and are lobbying for national legislation too
I don't think a summary of the waves is all that useful--I think it's much more compelling to speak directly to what feminism is now. It might also be useful to speak to the feminism that this community stands behind--a feminism that is intersectional, anti-racist, trans-inclusive, anti-capitalist, etc. I understand emphasizing that previous iterations of mainstream feminism got those things wrong, but I don't think you have to get bogged down in the minutiae of summarizing each wave to get that point across.
Also, just had to add because I haven't seen anyone else mention it: this entire post presupposes that white feminism was the only feminism that mattered in the first and second wave eras, but that completely erases the contributions of black feminists across history. Third wave feminism was not the introduction of intersectionality--black feminists during the first and second waves were already articulating the concept long before then, even if they weren't explicitly using that term.