It's impossible to guess or forecast the worst, but I hold bitcoin because there's a huge network in this coin, which means that many won't be so easy to part with. I don't see the void in front of altcoins, but it's all upside down. Unfortunately, if bitcoin has a terrible problem that would make it go down very badly then altcoins could get large.
Hopefully 2020 is different from 2019 and I hope 2020 will be a good year for Bitcoin or altcoin. Right now the price of Bitcoin is above $ 9,000 and I think this is a good sign at the beginning of the year. People who accumulate Bitcoin at low prices and believe that Bitcoin or cryptocurrency will get a profit