Hey, one of your publication member here, I will try to answer the 2,3,4 and 5th questions

Second Question
Yes and no, Bitcoin mining will be not be worthwhile to be done if the price doesn't increase but if the price increase mining can still be wortwhile. But as the halving process keep happening, it will reach a certain point that Bitcoin mining will become unworthy no matter what is the price for it and mining bitcoin will be completely stop.