Bitcoin may be superior to our current money, but will that be sufficient to succeed? Money evolves - we have had the gold standard, Bretton Woods system, floating exchange rate, etc. Bitcoin may be the flavour of today, but we can't be sure it will stay that way.
There's only one way to find out... wait and see. I don't personally think a new coin will come and dethrone Bitcoin, it's network effect is way too powerful. What could potentially happen is the abolition of cash and all transactions done digitally, either in the old way or with a government issued digital currency to compete against Bitcoin, to keep their fiat scam going.