Like I said, you haven't provided an argument why an MIT license provides more value for a developer than a GPL license. Your arguments are collectivist in nature - the GPL developers should sacrifice their own beliefs "for the greater good", but they're not even guaranteedly "better" because quite often, the "waste" you describe involves refactoring and innovation, which are both big benefits for software.
You gave as an example Blink vs Webkit and agreed to LLVM and GCC. In Blink's case, Google[0] argued:
> The main reason is that Chromium uses a different multi-process architecture from other WebKit-based browsers. So, over the years, supporting multiple architectures has led to increasing complexity for both the WebKit and Chromium communities, slowing down the collective pace of innovation.
In LLVM's case, I don't have a source available, but early in its development I recall arguments that it was easier to rearchitecture a new, modern compiler, rather than tweaking GCC, which carried a lot of baggage. This is quite common in open source, especially in web dev, where "screw it, I'll just rewrite this library better" happens constantly, even with MIT licensing.
The "enormous waste" you're describing is thus not universal, but waste from your point of view. Tactically, do you feel a good way to convince people to stop GPL-ing their software is to dismiss their goals as "waste" and demand they submit "to the greater good", at least, your interpretation of it?
[0] - http://www.chromium.org/blink/developer-faq#TOC-Why-is-Chrom...