Is it still possible to create such an infrastructure in which bitcoin will not fall below a certain level?
No, it's not like Stock market wherein there is a certain authority. The infrastructure is that we have different exchanges competing around, and then we have speculators, whales, buyers and sellers around the globe, 24x7x365. So there's no means or no one can stop as whether he wanted to buy and sell his bitcoin in the market. It might be whales that can affect the price or just ordinary retail investors like the majority of us here.