I think it was our best, and most noble, idea.
And yes, still relevant and viable, though we are going to have to bite the bullet and accept that we have to treat it with respect and fund it properly.
At one extreme, try googling any symptoms of ill health on an American site. They are full of people terrified that they may have to go to a doctor, knowing that their health insurance won't cover their treatment.
At the other, many systems are, of course, superior in the care offered, waiting times etc, but that is because more is paid in. We can't expect a world class service at a bargain basement price.
We also have to tackle the widespread abuse of the system (I have personal experience of people going to A & E with a cold, and others demanding antibiotics for minor ailments), but it was ever thus. I remember my dad saying that as soon as the NHS came into being, all the neighbours were off for their new glasses and false teeth, whether they needed them or not 