Blockchain will almost certainly survive longer. Bitcoin needs the blockchain but blockchain doesn't need the bitcoin.
So my question is will Bitcoin survive or fall???What will happen if every country launch their own crypto currency using Blockchain technology???Will Bitcoin disappear???Please share your views/opinions and experience.
Nobody can tell you whether bitcoin will actually survive or not or whether something else will come along that is better to replace it, but I can tell you with an almost certainty there will likely always be one form of decentralized currency whether that is bitcoin or not. Maybe think of bitcoin like a prototype. The first car or airplane was just a basic model and they have both obviously gone through constant evolution and models to get to the designs we have now.
We went from this:

To this:

And this:

To this:

We already have multiple cryptos that have tried to improve upon or add additional features to bitcoin's design. Who knows what cryptocurrency will look like in the future and some new model may come along that blows bitcoin out of the water in every aspect and that is something we as investors and users have to seriously consider.
Thanks for an excellent explanation.Blockchain technology will develop with course of time and more modified & advance forms of Blockchain came into light in near future and maybe same can happen with Bitcoin as well.