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Any p2p requires a native app as the browser can't act as a server.

This isn't 100% true. You have unrestricted network access from signed java applets if you request the right permissions (and the user clicks allow), for example.

Also, Bram might have come up with a reliable way around the same-origin-policy. DNS rebinding 2.0?

So a Java applet can listen on a port? Interesting, although not very practical.

Adobe Flash is also supposed to support some form of p2p connections, but I don't know anything about it.

The warning dialog is hella scary, though.

That is not necessarily true. With websockets, you can write a full-functioning p2p client in the browser.

WebSockets is only TCP. Bram is using his own networking stack based on UDP.

You can't connect two browsers directly via websockets, you can only connect to a server. A browser can't serve an incoming websockets connection.

Only if you can find some way around the same origin policy.

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