Diary of a rail fan in Kansai,Japan(Ver.2)

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Why monorail now?

CRRC unveils new-generation monorail train
http://www.metro-report.com/news/rolling-stock/single-view/view/crrc-unveils-new-generation-monorail-train.html

More than half a century ago, monorail was envisaged to replace subway systems. But, it hasn't overwhelmed momentum of subways yet.
So, I think it's unreasonable for CRRC to newly develope rolling stocks of monorail.
Do they foresee prosperity of monorails?
I'd like to know why.