Your second one doesn't undermine the case; it mainly discusses that tweaks are needed, not that the social democratic system doesn't work as you've implied. No one is arguing that the numbers never need to change; the entire discussion about the US is that the numbers need to change (in the other direction.)
As far as whether those people would accept the offers, it's possible at the margin, which are the minor effects I've mentioned. The numbers matter, though. France is a particularly bad example to use considering its job performance:
http://krugman.blogs.nytimes.com/2014/05/21/cheese-eating-jo...
It'd be different if you cited credible right-wing (economic) sources, but there are few left since the intellectual foundations of much of what passes for economics on that side of the divide (a chaotic Reagan-Thatcherism, a right-of-center Neoliberalism (older FT/Economist-style), or a wild-eyed goldbuggery) have fallen apart in the modern world. It's not symmetric at this juncture.
http://www.bloombergview.com/articles/2015-06-03/economics-t...
We can stop the discussion, sure. Let's do that.
If someone were to argue about the less biased nature of Cowen, Hanson, or Murray, or other RW intellectual, we might have a discussion. I don't agree with those people half or more of the time, but I definitely trust them to change their minds and look at the facts, rather than having an a priori position immune to facts. I don't expect the same from Cato, and certainly not from AEI or Heritage (whom I consider far more biased than Cato.)