Indian Currency can vary anywhere between 4 trillion to 8 trillion.
Points to equate into ur estimates.
-India has a free market currency as compared to a heavily regulated and manipulated in CHina .
the INR will start a very steep strengthening phase some where in the mid growth cycle if some strict measures aren't taken as more foreign inflows come in. (this could throw the the currency closer to the PPP based valuations and tht is 4 trillion+ as of 2012)
to add to that , America will try its best to make Indian commodities less competitive and (US commodities more inside the Indian market) with more Inflows hence in turn strengthening the INR further...
- a stable 7-8% is the best average tht India will muster over the next 10 years. Lower land mass and Legal constrains will keep the growth at a maximum manageable rate of 8%.imo i don't see it going any higher nor should it.
-India has a high probability of consolidating its large foreign information pool in the form of educated migrants coming back during this rising phase ,throwing a lot of uncertainty of what kind of growth India could have but all positive.
there are many more solid underlying factors tht could drastically chance the scenario for better or fr worse.
If people dont start blowing up left and right ,this is the worst India can do right now and that is 5.3%.
I don't see it dropping any further , even if the govt wants it ,it couldn't, given the entrepreneurial forces within the markets of India.