Anything can happen in the future, but for now Bitcoin is still the best blockchain that is widely used. There are other coins and they are also working but nothing can stop Bitcoin from being the best. Bitcoin is open, transparent and for all and it's already being accepted in some countries as means of transaction.
Yes, it could happen by means of time. We dont know what future can bring to us, it can make bitcoin higher or else, it can bring bitcoin to its downfall ano have another different coin. There will always be a probability in every situation.