Bitcoin has flaws... in your world the price of Bitcoin would keep inflating until only one currency remained (BTC), nobody would spend any money for fear of its value growing the following week! Why buy a car this week if its cheaper next week?
Arguably superior alternates for things are invented all the time... doesn't mean they gain mass adoption, so your list is meaningless.
Bitcoin has a big future, its just not what some dreamers let themselves believe. (In my opinion)
Because you need a car this week to go to your job and make more money. Although there are good arguments against deflation in the price of goods (mostly linked to how fiat currencies work), this isn't one of them. Computers have been getting cheaper and better for decades and yet there is still a thriving market. If anything, price deflation encourages efficiency in the market because people are more discerning when buyings goods and capital. In an inflationary economy, there is an incentive to make purchases you wouldn't otherwise make if the price was stable, because of the fear that if you do need it tomorrow, it'll cost more. Additionally, the transition from an inflationary environment to a deflationary one becomes rougher the worse the inflation is.