When will it be their undoing? As Keynes says, "in the long run we are all dead". And barring environmental catastrophe or global economic collapse, the German economy will still be going strong well after you and I are dead. I'd wager on that but have no way to collect.
So, they are arguably the most successful Western economy. Much of their success is due to government investment in education and innovation, and combinations of public and private innovation, along with a unique approach to savings, very strong SME's (often family owned), and a cultural valueing on knowledge, education, engineering and technology. They value their workers and put a high premium on safety and this is also enforced through regulation. They have high rates of taxation, governance and regulation - all these things that you argue are anathema to having a successful economy. And yet they have one of the most successful in the world. The onus is on you to explain why they are successful when free market ideology says that they won't be. Go ahead.
OK, Singapore. Singapore is a very mixed economy with high rates of state investment in business. In fact they call it a "state capitalist mixed economy" - and refer to it as the Singapore model. Bzzt. Another fail Giardiasis - you should have vetted your economies before you put them up as counter examples. Of course, I can guess your response - "Imagine how much better they would do if they abandoned all that and followed Giardiasis' patented free-market philosophy".
Hong Kong? Rates very highly on the indexes of "free economy" ie government intervention. Here's some other reasons why the Hong Kong economy does well. Financial hub - centre for the (highly regulated) stock exchange and merchant banks. A large port earning lots of income from that wonderfully free economy, China. It does have low rates of taxation - however all land in HK is owned by the government. Yes, ALL LAND - which is then leased back to private users. This serves to keep land values artificially high and income from leased land means government company tax and income tax can be kept low.
You are the classic case of an ideologue. Empirical evidence is rejected out of hand - because it contradicts your philosophy - or alternatively, twisted beyond recognition until it somehow does fit. As for me, I'm happy to say that in some circumstances, deregulation and free market approaches work and work well. But then, I try to think rationally, and actually pay attention to empirical evidence.
Get back to me when you can explain the success of the German economy. Or the Singaporean economy for that matter. Bye for now!