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.
There is truly big brighter future in bitcoin in the long run. And surely, until now there is no altcoins that can replace bitcoin, though they build big community in cryptoworld but that's not enough to replace it.
I agree that bitcoin will have a bigger and brighter future because of the Implementation of Segwit. Bitcoin updates is now easier than before. This means Bitcoin have now easier access to upgrades. Aside from that, creating smart contracts with bitcoin is made easier by the implementation of Segwit too. This means more people will be able to use Bitcoin and more application will be build around the bitcoin blockchain.