The Nazi and Stalinist regimes also stood to change the world too, you know. That didn't make them like the Apollo project. To be clear, I'm not trying to liken Bitcoin to either of those, just to point out that there's a spectrum from good to bad. I'm glad Apollo succeeded, but I'm also glad fascism didn't succeed. French Revolution changed the world too, in the short term, for the worse, but probably had a net positive in the long run.
Bitcoin? I'm not so sure. Bitcoin definitely stands to change the world, but I'm not sure for the better. Bitcoin would:
* By design, have exploding deflation
* Allow insane inter-generational wealth accumulation and disparity
* Block most of the controls used by central banks to stabilize the economy
* Allow a disk failure or hacker to wipe out someone's life savings
... and so on.
I'd actually liken it to the /early/ fascist, communist, and democratic regimes, which had a lot of good ideas for how to replace monarchies, a lot of bad ideas, and perhaps a 25% hit rate. The US worked out fairly well, at least once it got past the Articles of Confederation bit. France didn't work for a long time, but eventually worked out okay. Fascism and Soviet Communism /appeared/ to work better than what came before for a few years, and then imploded into horrors. The jury is still out on where the Chinese form of government lands.
At this point, we don't quite know which track we're on with Bitcoin. I was optimistic at the beginning, and now I'm more pessimistic, but it's too early to tell. In either case, we've learned a lot, and we could probably design a better system without many of Bitcoin's flaws.