I think you are trying to say that bitcoin will fail to become a mainstream currency because 60% of the world population don't have access to the computer. If I am understanding you correctly, then let me assure you that bitcoin is not structurally built and fit for becoming a mainstream currency in any way. It is an experimental virtual currency which implemented the idea of a decentralized currency successfully for the first time through blockchain technology. It is not trying to become a mainstream one.
So bitcoin will always be used by those with a certain level of technological expertise and not by any common people. Even though the process for bitcoin payment has been made very simpler by many third party wallet provider, but majority of the governments will not want to allow bitcoin to mingle with their own centralized currency system. It is and will always remain as a digital currency and an excellent store of value.
Everything that avikz said is on point. It is true that Bitcoin is not for everyone as it has a very complex structure despite being tried simplified by some third party application. One may say that its accessibility is a limitation towards being used widely but the truth is that if it becomes a mainstream currency, people would incorporate other aspects that may defeat its purpose. To simply put, Bitcoin is a cryptocurrency that allows exclusive transaction over the virtual world.
If bitcoin (or anything, really) isn't used by "common" people it fails. But I think the cryptocurrencies will be used by all in 5-7 years. The infrastructure is in place already, we just need better algos to function on mobile devices.