Which politicians support Bitcoin? Do you think world leaders will embrace crypto/Blockchain tech at its fullest?
No politician truly supports Bitcoin, Bitcoin was created to remove centralization in economy, which if achieved would put many politicians out of their jobs. Even those who say that they support it actually want to regulate it and maybe even control it. The best support a politician can give to Bitcoin is to just ignore it.
What impact will mainstream politics have in the future direction of Bitcoin?
None, Bitcoin community and developers don't care that much about what politicians say or do regarding Bitcoin.