I'm interested in at least discussing pos for security reasons. I don't think thing energy use is an issue for the foreseeable future, although that seems to be slope's concern.
I think it would be proper to call a PoS version of bitcoin, bit
shares instead. Dividends are awarded to share holders for holding stake, rather than to miners for doing work. Arguments are settled based on how many shares one holds, rather than by how much work one performs.
Im a little late to this thread, but I just came here to drop this link:
http://bitshares.org/bitshares is already a thing, and its very promising