They've never had a supermajority large enough to allow for a Medicare tax increase, because that's the only way finding could increase. Hell, even the ACA required an enormous amount of compromise to get through the door and that was during a time when they could hurdle the filibuster without issue.
As to who ruined things, well, when was the Golden Era of medicine and who was in power?
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When did things start to get ugly? When Reaganites started demanding cuts to government services and taxes. Both of the systems that have led to you having lower pay over the last 20+ years were designed by Republicans and passed by Republican majorities to contain how much the government spends on you. Not that Democrats have any of us in mind either- they serve nursing unions and hospital systems. But to pretend it's some big conspiracy solely on the part of Democrats to socialize medicine in this country is nonsense. Republicans are the reason your salaries are being cut and Democrats are the reason private practice is dying due to administrative nonsense added by the ACA that were designed to serve hospital systems. One party is trying to take your money, the other your autonomy. Stop thinking either of them have your best interests in mind.
It is always amusing for me to see conservatives complain that the government isn't giving them a big enough payment though. Stop taking payments from the government, problem solved. If more physicians would stand up for themselves, rather than act like passive victims to the system, maybe things would change. Stick to private insurance or cash pay, problem solved. If enough people do it the government will eventually blink.