This doesn't follow because it would assume that XMR is currently maxed out on bandwidth or Moore's Law considerations, which is false.
Terabit bandwidth will be available to fixed locations in that time-frame. Mobile bandwidth isn't really an issue, because thin clients will be used for mobile, exclusively, for the foreseeable future. I just don't see bandwidth as an issue for XMR, ever. For some users, always, but for network strength and integrity, as well as capacity? No. Lower consumption would aid in decentralization, but unless your hard requirement is to maximize decentralization (as I suspect it is for AnonyMint) it's not a problem.
I mis-spoke when I suggested flash was necessary to the blockchain. Magnetic storage is quite cheap and adequate for full nodes, and will already scale 10^3.
Even if his requirement is for maximized decentralization his argument is still false. PCs are not maxed out on XMR today. Even some smartphones could almost certainly run XMR today fairly well. (I'm running it on a nettop that is smartphone-class, and it is nowhere near maxed out.)