I'm afraid that without DOM access and GC it won't get much traction or testing as far as the community is concerned. Did anyone took wasm seriously?(i.e run their main external/internal app on wasm as a beta version)
I know ...but when? 2030? There is no timeline. My point is that GC and DOM should have been part of the MVP if it were to gain any traction as the assembly of the web. Otherwise it remains an experiment/niche like Asm.js, PNaCI etc. I didn't see many(if any) "todo" apps in wasm yet.
https://github.com/WebAssembly/design/blob/master/GC.md