4. I think the new QT with bitcoin trading in the Nxt client would be awesome. Nxt could act as a bank where as bitcoin the cash we carry around (hence we don't carry a tons of cash around, as most of our money is in the bank). Since bitcoin network is vulnerable to 51% attacks. So a future usage of both these cryptos can act as a bank and spending money?
Sorry, but there can be only one. Bitcoin or Nxt, not both.
wow, it is THAT serious then, eh?

my idea is, a few coins can co-exist, just like there are many brands of cars, many brands of wine, etc.
and compete on a healthy basis, of course there'll always been some maniacs trying to compete unfairly.