Dude, it is about Pakistan and also about US to some extent. Remember Pak can play spoil sport anytime. India has considered various other alternatives also like getting pipeline trhough central asia and underwater etc which are too expensive. No doubt, US does not want it.
Nope, wrong. the limit is lifetime of reactor.
If you remember, Russia had also stopped supplies some time back as India was not signatory to any treaty. Also nuclear technology in US and Europe is much better. Bottomline is if Russia can supply Uranium, where is the fear of US stopping supplies?