I have the master key and the post key, but can't find an option to recover the other keys.
Use the password reset with your owner key (I assume that is what you are referring to as the master key).
Bitcoin hasn't gone mainstream because if I have to stay awake at night worrying about how the actions of Jihan Wu, or Gmaxwell reacting to his actions is going to do to the price, then we obviously have no Nash equilibrium. Seems like the software was designed in a way assuming there would be so many individual miners that one person influencing all of them would not be possible, and the act of forking would involve just blind voting without collusion. Bitcoin just has a lot of annoyances like this where you can't really justify it's market cap going equal or higher than metals.
Both wrong. Bitcoin hasn't gone mainstream because mainstream is happy with USD/EUR/etc. and Bitcoin doesn't give them the order of magnitude advantages that are necessary to overcome the huge network effect.
This was less true in 2009-2011 in the wake of the 2008 financial crisis. Many people were open to at least the possibility to think about replacing the existing system and be their own bank, even if that involved some compromises. Memories are short and now they are not.
Crypto as mainstream is waiting for the next financial crisis to even have enough potential to get off the ground that people are willing to really invest in trying to make that happen. For now it is fringe uses (though this includes some very large ones potentially, just not "mainstream"), experiments, and a solution in search of a problem.