What actually matter is not the actual price, it's the trend.
If the price is stable or rising, the adoption increases. People and businesses get more confident in bitcoin and start using it. More miners start up their gears.
If the price is falling, people get scared / suspicious and will go away from bitcoin.
I agree with you. If the price of bitcoin would go down again many investors might withdraw from their deals and the interest for bitcoin might get less. There are people who are just interested with bitcoin because of its current price now in the market. I have experienced telling some of my friends about crypto when its price was just about 50K. There is this doubtful expression on their faces at that time. But the sudden rise of bitcoins price from 70K to 130K got their attention and now they are asking about it now.
Please mention the currency you're talking about cause I'm pretty damn sure bitcoin hasn't reached 50k usd or euros .
As for "investors" they can withdraw and go to hell from my point of view.
Let bitcoin be and do what it was supposed to be and solve the problems it meant to.