Yeah , it is old. And there will be better versions of BTC. But I think it will have always a lot of worth, because it is the father off all the cryptos.
Of course, for investing it is more intresting to put money in the new technologys, because in a long term it is possible to 100X or even 1000X, when you buy at a good moment. And i agree that the market dominance of BTC will slowly go down