Even with optimistic estimates, it's going to be years, likely decades, before you can rely on these features being supported by the majorly of browsers. That's kind of sad but is the hard reality. I hope they come up with a good design.

I think they should be very conservative about what they propose. It should be a very obvious improvement to the language or have a lot of design time spent on it. If all major browser developers are not on board (Microsoft?) then the improvement is much less valuable.