That's not right because Bitcoin is still the most widely traded cryptocurrency the amount of impact it does to altcoins won't change. Last year Bitcoin's dominance was less than 40% and we all saw how many billions of dollars were wiped because of Bitcoin's gradual decline. Kasabus is correct the dominance is not a good metric to determine how big can a cryptocurrency cause to other cryptocurrencies.
Yes the impact on altcoins won't change. Bitcoin is still the most widely adopted Cryptocurrency and is the face of Blockchain and consumer's preference is not something you can overwrite easily. Every businessman with a big enough organization or group of them can tell you how truth that statement is.
The impact won't be for Bitcoin only. It will affect the whole Crypto World one way or another.