No, it's not even remotely fixable. If your extension requires natively compiled code for speed, you need a compiler, period. Going back to forcing developers to cross-compile binaries for every OS under the sun is not what I would call a fix.

No one's asking anyone to cross-compile binaries for every OS. You compile binaries for the few important platforms and provide source for the rest. As I mentioned in my other reply, open source projects have been doing this for a long while.

Almost every open source library on my Mac is compiled from source. Name your system: homebrew, ports, fink, they have all switch to compiling from source.

Every scripting extension repository I know assumes you have a compiler to compile native libraries for extensions.

And this has been true for "a long while". The change you are proposing is not trivial, and it has far-reaching implications. It is a step backwards, and one that every developer should oppose.