Illinois Comptroller Judy Baar Topinka is warning of “a $2 billion collapse” next year when the state’s temporary income tax increase begins to roll back.  Lawmakers approved a temporary income tax hike in 2011.  But it’s set to decrease from 5 percent to 3.75 percent in January leaving a big budget hole.  Governor Pat Quinn has pushed for extending the increase, but the idea has been unpopular in an election year.  Topinka likens the decrease to a “heart attack” to state finances.  She says she’d rather see it phased out over two years to give lawmakers time to cut spending.