The problems could be in how long that "wood-glass" lasts. Will you see cracks soon? Will any insects start drilling your windows?
Yes, but that's why in certain areas you need to do termite inspections because the treated wood doesn't provide 100% protection. Also the wooden parts are normally protected by other materials to not be exposed to rain and rot - in this one the epoxy layer would likely do that, but still, it depends on good coverage/protection.
surely industry will find ways to reprocess recycled material to fit requirements??? or use more concrete or more rebar or something?
can the folks who mine river or marine sand be tasked to put desert sand back to replace what they mined?
And unlike corn-based plastics, the raw materials for glass aren't food.
https://www.theonion.com/geologists-we-may-be-slowly-running...
;)