Couple ideas:
- specify profiles that can be targetted by web developers and browser developers; demand web assets to be delivered in sane and portable formats (rather than a mish-mash of JSON configs and plugins)
- in public tenders, demand that web sites for public information don't become apps: announce sites requiring JavaScript as application/html
- promote, invest into new web frameworks for apps (not sites) that abstract/isolate from HTML+CSS as underlying rendering mechanisms such that these can run stand-alone (like applets used to); I kindof like React, but unfortunately it ties apps to browser runtimes which isn't adequate for apps most of the time IMO
- transfer specs to standardization bodies with fair representation and transparency
- push for energy-efficiency; require that sites with not that great information density can render on easily-produced devices before the end of times
- push distributed web tech
Going for complete backward-compat is impossible, but humans used to do just fine without today's web of shit. HTML is rooted in markup technology which had highly organized content representations since the late 1960s.