As long as us working serfs can multiply faster than we are being killed off, Single Payer will be a luxury this country(read: our overlords) can't afford.

Unfortunately not in my lifetime.

Those who can't afford the premiums can get subsidies.

I assume you mean the FEHB should be opened up if the ACA is struck down. But without a mandate, wouldn't this lead to the problem of adverse selection? Would it not drive up the costs of FEHB plans considerably?

A little-known fact is that the Affordable Care Act does precisely the opposite of what you propose. Under Section 1312, it requires members of Congress and their staff to use health plans created under the ACA or offered through a state-based insurance exchange, rather than the FEHB plans they use now.

independent from state control, so there is consistency in coverage. Instead of having one or two companies to choose from, you have many. That forces competition you wouldn't see in individual states. If a plan starts fucking over its customers, it runs the risk of being booted from the plan. The threat of being denied access to tens of millions moderates behavior.

Still how many non congressional employees are on the FEHB?

I think the idea of opening the program to everyone during annual enrollment periods might work. According to Wikipedia, this idea has been proposed a number of times, including by John Kerry in 2004. I don't recall it being discussed during the health care reform debate.

You cannot maximize both profit and quality at the same time.

That's what my dictionary says anyway.

nt