5. Investors will sell their btc and start buying different altcoins
I do not think any wise investor would do that, no matter what happens to the bitcoin price, whether it rises or falls to any level, actually selling it off to buy altcoins that are not as consistent as it is, is bad trading imho.
It's hard to find a good altcoin in the crypto market this days, Bitcoin has completely overshadowed it, and I think what any wise investor should do is to try and own more bitcoins while it's still affordable for them.
The investors don't have to pay the price of a bear market if there are many dead coins in the industry. They will diversify risks among the best altcoins and they prefer to sell the altcoins for staking more Bitcoin. If the BTC price fall suddenly, the market will react to the cause of this dump. The traders will close the open trading positions due to the hedging their market risks. The traders will look for excuses in the total market atmosphere in order to understand the reasons behind the last dump. In this time period, bulls will attack the bear orders for accumulation more BTC or reliable altcoin while the prices are cheap in the correction mood.