It's to early to predict if Bitcoin moving forward, traders watching also and they can manipulate price of Bitcoin, they bought in low price and now they can sell it. If Bitcoin going to 15k$ many altcoin going down also,, many of them defend of Bitcoin price.
I think someone holds bitcoin for one thing because the price of bitcoin is moving forward, and that's one of the factors that attracts users. There is potential for profit there. Yes definitely most people not only buy bitcoin, but also with altcoins. But what I see, people are buying altcoins for short term trading, while bitcoin for their long term.