I agree, it is more profitable to trade altcoins-Bitcoin pair. I have seen people earning 10x to 100x of their holdings with altcoin.
I think it is still worth to trade bitcoin today, Bitcoin have many trading pairs not only USD or other popular money, Bitcoin can also be traded with thousand of altcoin in the market. If it does not do well ing fiat pairs, why not try the altcoin pair.
Trading is one of the good source of getting bitcoin, it offers us ways to trade within the value we wanted,we are free to choose on whether we will sell it that time, we should be careful on choosing what we will trade same if we will invest on some sites or any transactions we should be careful.