Despite that fast transactions, people don't usually use Bitcoin.
I dont think fast transactions and usage have a direct correlation when you bring in the adoption and knowledge about the method in the first place. There are many people who dont know that bitcoin exists, even if they do know that, they still dont know where to buy it or where to spend it. We are among a niche few who know and use bitcoin but adoption becomes a deciding factor at one time.
Also, I think it will not make the economy develop or evolve but with the help of blockchain technology, it might be of help in a way for the country. It is valuable but that doesn't really matter since as long as a small population is using it in the country, it will not matter at all.
Well blockchain technology is being used by different tech companies for various purposes and they open up new avenues of thoughts no ventured before or more services for the commoners.