Well one thing I am sure of is this: it would be the march of the IITs to oblivion and obscurity. The aura and exclusivity attached to the original IITs will be no more....in fact people still refer to the original five.
If the government is really serious about improving the lot of the other engineering colleges, it could still go on with the proposed funding on the lines of the vision 2015 document they've come up with. Better restrict the use of the IIT logo.