At this stage we don't see any competition to bitcoins but there is no guarantee that the same thing will be followed in future too, as there is a possibility that bitcoin can get replaced in future by some new and innovative currency.
Well i dont think so because as you said bitcoin has no competition as of now,and in the future it doesnt seem any other coin has that potential to even compete with the bitcoins,it will always be most important crypto-currency.
bitcoin are the first cryptocurrency , the first big thing invented on internet
i don't think soon or in the future any other cryptocurrency can replace bitcoin
even it was amazing ethereum within 2 years become popular as litecoin and dogecoin
i believe bitcoin will be honored as the mother of cryptocurrency.