2) I could see Bitcoin gaining fastest in the business realm, where they often need to store reserves for years at a time and Bitcoin offers a tax advantage in some countries, like Germany.
Discussion
* If you hold gold or Bitcoin for at least 1 year, it is tax-free, in Germany.
The use of Bitcoin is also nearly tax-free, here, so long as you do not earn profits over the €1000 limit per year.
This means Bitcoin is great as a SoV and for small purchase or zaps, but terrible for paying your rent.