Sadly you're almost certainly right. Most of the places I could see wanting to reverse-engineer the displayed HTML into Markdown are actually sites using their own hackish, inconsistently rendered output. You'd end up needing per-site tweaks and that'd kind of render the whole thing unworkable and pointless.
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might be worth trying. however, i'm still not convinced the presented use-case would be useful rather than just cool.
Sadly you're almost certainly right. Most of the places I could see wanting to reverse-engineer the displayed HTML into Markdown are actually sites using their own hackish, inconsistently rendered output. You'd end up needing per-site tweaks and that'd kind of render the whole thing unworkable and pointless.