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> From that I would infer and speculate that the NSA found a pragmatic solution to factorization long ago.

Or they judge that a pragmatic solution is within the realm of possibility, and they don't want take the chance of being caught with their pants down. They probably have the resources to take on many extra operational costs to avoid theoretical risks. One of the quotes on his Wikipedia pages is: "Never underestimate the attention, risk, money and time that an opponent will put into reading traffic."

Because Robert Morris Sr said something hypothetical doesn't mean one should speculate.

What are the other options?

One time pad.

One time pads are still used by governments. They can easily control the hard parts (secure pad distribution and operational procedure).

Elliptic curve

Couriers, duh: http://www.dailykos.com/story/2016/7/29/1554321/-Trump-think...