Legislative action and Firefox adoption banners were mentioned. Any other suggestions?
The greatest impediment to any alternate less centralized approach is IPv6 adoption.
Polish the heck out of it and don't allow it to feature creep into an Outlook wannabe. Detach it from culture wars and virtue signaling. Solicit public feedback and democratically prioritize new work. Make it your org's sole calling. Don't create conflicts of interest by being sugardaddied by your main competitor. Don't bother with trying to create new standards that nobody cares about, just do better than Apple and Google.
Create sandboxed ephemeral environments for DRMed content so people can watch their shows. Maybe even proxy it server-side and just stream the pixels.
Govern all of this from a non US location so our corrupt corporate owned politicos can't legislate it out of existence.
Essentially just be what Mozilla was before they sold out to Google.