I don't think that bitcoin will be ever replaced by any other crypto currency as I don't see any competition to bitcoin at a moment and even in future bitcoin will keep on updating itself with the demand of people so its hard for any crypto to replace bitcoins.
There is no competition for bitcoin at a moment but it can be changed in future when new technology will arrive and at that time there is a possibility that bitcoin can get replaced by other currency.
i think bitcoin is the most popular currency as majority of people are using it and as you think that in future it could be replace by new currency with the arrive of new technologies, well so i think that when in future the new technologies arrive so bitcoin will also adopt these technologies and update its self.
it is commonplace something obsolete will be replaced with something new and more sophisticated. is it possible bitcoin increasingly sophisticated in the future? and who will carry out the renewal?
There is no point in becoming more sophisticated than is actually required
There are quite a few altcoins pretty sophisticated (or should I say complicated?), but this sophistication somehow didn't make them more popular than Bitcoin. Money is likely one of the most conservative fields of human activity and rightfully so. On the other hand, we still don't see any altcoin project allowing truly instant transactions and payments. Dash coin was said to be making that possible, but it turned out that this claim was essentially false