We can debate all day about specific tradeoffs made for specific projects - I would almost never advocate a rewrite just for the sake of using a newer technology unless it has more-than-incremental benefits - but that's not what I'm talking about.

All I'm really trying to argue against is the mindset that "I could technically do this with the technology I've been comfy with for the past decade, therefore this new technology's entire existence is a waste of time and it's a waste of my time to learn about it." Learning != rewriting. And new projects != rewriting. It may end up being as simple as, "I just lost my job and nobody uses the technology I was using there any more, so now I can't get hired."