> * Now a really good answer or tip that would otherwise be on the 'regular' stackoverflow (albeit in broken English) will remain, unknown*
This assumes that, had the Portuguese site not existed, the question would have been answered on the English site. There is also the possibility that the question would not have been answered at all.
Have you ever encountered something, sometimes, that you know doesn't click, but can't explain why? I really think this is a bad idea, and somehow, a waste of resources, a repetition of things. But...
It will affect me little if I pretend it doesn't exist and continue using stackoverflow as I have been until now. Just ignore 'the news' and move on.
This assumes that, had the Portuguese site not existed, the question would have been answered on the English site. There is also the possibility that the question would not have been answered at all.