Big IT shops will shut down most of their operation. Several hundreds of thousands of people will lose jobs. They in turn will default on their loans. For those who don't know the real estate scenario in Bangalore, these days even mediocre 2BHK flats sell for >65 lacs. People who are in neck deep in debt, will default. Big real estate projects(which are a common place in Bangalore today) and even small time real estate builders will crash and burn. The lenders to those builders will in turn crash and burn.
A lot of bad blood will be eliminated and won't be able to come back for years.
But I think it will ultimately do good for IT community as a whole. The current scenario is full of super idiots powered by dirtiest form of politics climbing the corporate hierarchies and building their real estate wealth with that money and position.
I for one am praying for this crash to happen.