It's possible that a non-Google vendor might see the approach as a differentiator. Of these, Mozilla seems to be footgunning itself with exceptional facility, Apple would serve only its own hardware platforms in all likelihood, and the remaining players (KDE / Webkit) are so small as to be utterly outclassed.
The remaining possibility would be a generalised HTTP/HTML (and if possible other document markup) programming libraries.
Does anyone know how to build a modular plugin sub-system?
Please do!
I already sent some money in that direction and will be happy to send more.
I will also be happy to test it (commit to 1-2 hours or maybe more pr week of actual following-a-plan testing not just "using it and see if it works" for a few weeks) but I am afraid I can't learn enough Rust to be helpful at the moment (small kids and a full time job).
This? https://servo.org/