There are some solutions like lightning network. Also, no one is saying that blockchain in its current state solves all problem better than what we have now. W

There are some solutions like lightning network. Also, no one is saying that blockchain in its current state solves all problem better than what we have now. What matters, and why some people would bet on certain blockchains/tokens/projects/etc is the belief that there are certain projects that have real potential to disrupt a big incumbent like Visa.