Nokia is hardky losing the battle. The phones you mention are midrange at best so the point is still very much valid.
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Market Situation is changing fast in India now
and Dual Sim is need of the time
with high end mobiles too.
Lenovo have good Android Phones with Dual Sim
and are quite good.
There are many manufacturers trying to address this market demand.
If Windows can make an afordable phone with most of the features
will help it gaining the market share.
It seems Nokia is getting aggressive in the Mobile Market of India.
A Dual Sim Windows Mobile will be a better Idea.