1. There is very little to no chance that all the governments in the world are going to cooperate to create a centralized database about their citizens. Most countries don't want to do it and I don't see China or the US doing it anytime soon.
2. The biometric passport is not a paper passport already. The same way the SIM chip disappeared, your "passport" can disappear too.
3. The non-biometric passport will remain valid for at least 20-30 more years. I am talking about these very old passport that only a few handful of countries still issue including the USA (for particular situations). This backward compatibility will mean that the paper passports (even non-biometric!) will remain supported for a very long time.