that's terrible. 10% is far too high
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http://laredcubana.blogspot.co.uk/2015/09/cuban-infrastructu...
I would not want to write anything big in Perl 5. But for small-ish scripts (say, less than a thousand lines) it is pretty hard to beat.
I can write a web application in some homebrew <insert language> and it can grow to 40 developers, 1000 db tables and thousands of files. But it would be terrible to work on (I know I've seen it). Or i can write the same thing with a framework, and have it much more manageable.
Realistically, when was the last time you say down and wrote a big application in vanilla <insert language>?
I think one of the bigger problems with a non-native plugin api is that doing anything non-trivial could become either unnecessarily complex or possibly even intractable. I'd be curious how they are planning to support extensions like vimperator or even no-script.