Using Cryptocurrency as a form of payment is a goal that everyone expects it to achieve. Due to many objections and obstacles from governments, many developers do not accept Crypto as official payment currency. But there are still many traders who use it as a currency to make transactions with each other. Many ICO projects use this idea to attract investors, but almost all projects fail.
To me ICOs are not that popular anymore, we've got exchanges and e-commerce to get ico implemented
Investing in ICO is a big failure in 2018, not many people like it anymore. You are correct, Crypto is definitely a useful payment method, it will become more and more popular if it is not restricted by the governments of many countries.