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IMO and i think most will agree that hindi is one of the more long term languages,
as i am not a native or in anyway claim to know much of the indian market i can only say after visiting india in places that are not considered major cities i.e dahrhamsala,rishikesh,manali - in everyone of these cities there is at least 1 internet cafe where the locals go to use the internet and with time more and more will have access from they're homes (the only place they had hindi on they're machines is there - obviously there is a need)

Also, India has 1,095,351,995 (July 2006 est.) people.
even if you take 5% (just over 50 million) it still is more then some other languages that most agree are valuable and bring some traffic today even.