True, another extension would be disastrous, we may never recover from the fallout of malformed UCS2-esque UTF-16. Let's just hope no one fixes all the broken,

True, another extension would be disastrous, we may never recover from the fallout of malformed UCS2-esque UTF-16. Let's just hope no one fixes all the broken, accidentally forward-compatible decoders in the practically infinite amount of time it will take to completely fill the Unicode codespace.