I'm sure your convinced of bitcoins flaws, and it might just be that your not very good at arguing them, but I've read that newbitcoin paper a few times (including when you first linked it) and I'm just not buying it. In fact a lot of those arguments are just stupid, (sorry, I really hate to phrase it that way, since I don't like to troll) but honestly - 'bitcoin is not really decentralised'
For the record I'm not a hardcore bitcoin evangelist; I also think bitcoin has flaws. I just don't think they outweigh it's benefits (yet).
*edit* just wondering, have you given up on cryptocurrencies in general, or just bitcoin in particular. no reason, just curious.