If the price of the Altcoin goes up, then the Bitcoin value will go up. The reason is that when the price of Bitcoin goes up, the price of Altcoin goes up as well.
If people start buying Altcoin more than today, the price of Bitcoin will go up as well.
If the price of Bitcoin goes up by 2021, it will be a record.
Am I right?
You are definitely right, so much is depends on the price of Bitcoin although there are instances where the price of altcoins are moving fast than Bitcoin, but when it comes to stability of the price nothing beats Bitcoin, this is the only best performing stocks in the world even beating gold or any stock in the market.