Incorporating other crypto currencies may not only be desirable but essential further down the track, IMHO bitcoins future is far from certain and as it becomes more mainstream the rules and regs will continue to mount up against it making it harder to use anonymously. Governments will be desperate to make it harder for users of bitcoin to source and cash out anonymously, they will also want to control it because that's what they do best, they try and control everything whilst robbing us of our privacy and rights as individuals to live free from coercion and control. More importantly they will want their slice of the pie, all this money changing hands and the government gets nothing? they just won't stand for it. We need to diversify looking into the future to constantly evolve and keep ahead of the enemy where at all possible, if we stand still we will be finished.