The challenge that this faces is the fact that many sites will restrict/block access from TOR exit nodes. These forums will even make you pay a (very) small amount of BTC in order to access your account if you try to access via TOR (AFAIK this is only a one time payment).
Does this bitcoin forum allow user to use tor to register and post?
You can browse the forum and visit the registration form, which does not seem to block. I think it's allowed
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Problem with Tor and IP2 is that onion routing in a low-latency node based network is a fundamentally flawed concept. If you want anonymity against the feds, we will need a different conceptual design.
The way TOR is constructed is indeed drawing attention. I think, in order to have anonymity, a new conceptual design is needed as you mentioned.