ProtonMail should support Monero. For now, I pay using a group of Monero wallets I churn every few hours and xmr.to. I suppose Bitcoin is the least common denominator in that sense.
That's correct. It is very anti-anonymous by its design; its security rests everyone verifying the transactions. The distinction you make is the same one I attempt to make by arguing against anonymity as a goal. Both Bitcoin and Tor are, in the mind of the public, construed as ways to be anonymous on the Internet. That is dangerous.
You mean "we" == a dozen of first world countries? There is strong demand for anonymity all over the world.
Is there? From whom? Facebook is still growing rapidly and now claims more than 2B users. It seems that not even privacy is in high demand, much less anonymity.
We need to move beyond the obsession with anonymity and refocus the goal as being privacy. Then, recognize that privacy has several levels. That way, the expectation is more clear.