Millions of Americans will be in line for subsidized health care, so I just wonder, do y'all on the right really want to subsidize them through a private insurance company or the cheaper public option. Do you honestly want subsidies for low income people to boost profits for insurance companies???

"As a result, premiums in the public plan would be higher than the average for private plans."

But then they would be higher still if these people had private insurance subsidized. Same question still applies, would you want to increase private insurance company profits or use the cheaper public plan???
What it really illustrates though is the foolishness of prventing a real single payer system that would insure everyone instead of a private system for the younger, healthier demographics and a public plan (Medicare) for the older, sicker demographic. If Medicare is good enough for our parents it would be good enough for us, and gee whiz, how come the CBO won't do a cost comparison between Medicare for all and the current system???
Why...because the saving would be tremendous and everyone knows it.

Citizen, because they already have a "Cadillac Plan" that we get to pay for.
I just think the whole argument is crazy, if Medicare is good enough for us when we reach 65 and, more than likely, will then actually need more health care services the why would it not be good enough for us now, while we probably require very little medical care???
If people would honestly ask themselves that question I think it would be hard to come up with a great argument for continuing with such a system which is obvioulsy more concerned with preserving the profits of insurance companies than providing quality health care to Americans for the lowest possible cost which is what we should be doing.

"the answers to those questions might be why giving everyone medicare isn't being considered."

You don't even believe that. The reason it isn't being considered is because the insurance industry has deep pockets and lots of lobbyists. The other objections you mention are all details that could be worked out.
First, those under 65 would still pay premiums but they would be lower.
Second, the payment system could be revised to prevent any problem with doctors and hospitals, etc.
It is obvious that without the profit, advertising and bloated adminstrative staffs of insurance companies we would start saving huge amounts of money.

"If I was offering the private plan, I'd raise my price to be closer to the public plan.

I'm still cheaper, but I'm going to make more money."

You're assuming that the anti-trust exemptions will remain in effect, hopefully they won't and real competition can begin.
I think there actually should be a "trigger" but I think it should be something like, if rates don't stabilize and begin to go down within 2 years we automatically just switch to Medicare Part E and be done with it.