You mean many investors will cash out from bitcoin to altcoin after halving? I am not sure who got it wrong but I think the bitcoin price grows dramatically after the halving period.
It is untrue if the investors will moves their funds from Bitcoin to altcoins after Bitcoin halving. Why?
We know that Bitcoin will increase gradually after the Bitcoin halving and it needs some months to achieve its peak (new ATH). The investors must wait for the peak to sell their Bitcoin. Although not all the investors will wait for the peak, they must wait for the big increase after the halving. Sure, there will be altcoins season as well but it doesn't mean the investors must ignore the potential of profits from Bitcoin.
I think alltcoin's rise will always be higher than bitcoin, and of course the fall will also be higher, so altcoins will have more impact on the market.
Indeed. Some altcoins have higher volatility than Bitcoin. So they have the chance to skyrocket more than Bitcoin. But we must know that not every altcoin will increase better than Bitcoin, some may have no significant increase during this bullish season. Don't generalize it, there are also many altcoins that seem unconvincing to increase! Anyway, what do you mean by altcoins to have more impact? Bitcoin must be the coin that has bigger role in the market. It will always to bring bigger impact than other coins.