I don't think so the alts are the assets and also the back up of bitcoin and traders also when the market of bitcoin is not that good and it is decreasing for sure many trader will pull out their money and putting it on some alts and it is normal in trading. There is more risk in holding altcoins. HOwever, they do bring us a great amount of money which bitcoin can not provide. If you want to be rich, you need to understand cryptocurrency in order to make a right investment on a right altcoin