From what I have been able to determine, Hashgraph is not resistant to adversarial nodes, or to Sybil attacks. There's a reason it's only been implemented in closed applications so far, and there is no discussion of having an open or public version of it yet (or at all.)
If you are curious if masternodes can scale to data-center proportions, while still being supported by income from transactions, the answer is yes, even assuming we are stuck at today's hardware and we never get price or performance improvements while needing to cover the whole world's transnational capacity.
This was proven (with supporting evidence) by one of the folks in the BCH community.
http://blog.vermorel.com/journal/2017/12/17/terabyte-blocks-for-bitcoin-cash.html
If you are curious if masternodes can scale to data-center proportions, while still being supported by income from transactions, the answer is yes, even assuming we are stuck at today's hardware and we never get price or performance improvements while needing to cover the whole world's transnational capacity.
This was proven (with supporting evidence) by one of the folks in the BCH community.
http://blog.vermorel.com/journal/2017/12/17/terabyte-blocks-for-bitcoin-cash.html