i think that bitcoin is going to replace all worlds money because the technology is really great and it is impossible for governments to have impact on bitcoins also its impossible to hack this technology
I think there's a potential bright future. I don't think it's going to be replacing other money anywhere near our lifetimes. Governments could do plenty to strangle it if they chose to. Right now all they have to do is shut down all the exchanges and it's pretty much good night. A small hard core of Bitcoin only commerce might remain but most users and almost all businesses would fall away.
You realise that Bitcoin does not exist in a vaccuum? That other trends exist that put that scenario in doubt? The only way Bitcoin will fail to replace other currencies in your lifetime will be if you're already almost dead.