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?
Basically, Bitcoin affect in altcoin price. Altcoin is coin which follows Bitcoin, not vice versa
But you must understand that not ALL time is like that. sometimes, there is others scenario happened
read this to understand the correlation between them:
https://hackernoon.com/about-those-crypto-correlations-e68720707efehttps://research.binance.com/analysis/correlations-q3-2019