I agree with your need for numbers.
I project BSE < 10,000 by end of 2008. However, it is really difficult to measure in nominal term, because it stock market projection depends on INR/USD parity, inflation rate (meaning RBI M3 money supply), and other factors.
Measured in USD terms (or better yet, when measured in 10 grams of gold), BSE will crash by atleast 30%.
Why do I say - when measured in gold? Because GOLD IS REAL MONEY.
Historically, 1 BSE was always 5-10% below the price of 10 grams of Gold. Although nominally, BSE seems to have had 'magnificent growth', when measured in GOLD terms, 1 BSE still trades around 10 grams of Gold.
Given our current economic conditions, poor fiscal and monetary policies, and complete cluelessness of the retail investor, I think a 30% drop in stock prices would be an optimistic estimate.
.