I dont see this as an issue though. Terminals are pretty much a solved problem, they dont need any new features. IMO it makes more sense to spend effort on improving tmux<->terminal interop rather than adding fancy graphics protocols that we dont actually need.
I even theorise they could cut the Google funding. There are so many people who would donate to firefox, but don't, because 1) they dont need the money, and 2) the money wouldn't go to firefox anyway. I even remember talking to a long time Mozilla employee at fosdem, and him telling me donating was pointless for those reasons.
They're not a good steward of this project and imo they should let it fly free. The problem is Mozilla would die without it because nobody cares about anything else they do, so their donations would plummet.