It depends on how hard and fast it's stepped on. The Federal Courts have been upholding unconstitutional law with overt corrupt logic (plain as day, to anyone who looks at the cited cases, Miller and Presser) for upwards of 70 years, and the people are okay with that.
More recently, the United States Supreme Court, in Heller, twisted the Miller case to stand for the opposite of what is says, and the gun-right lobby cheered! Hooray! We win!
If the United States Supreme Court denies cert to the Chicago/NRA and Maloney (nunchucks) cases, we have status quo. And status quo (30+ years guns have been banned in Chicago) hasn't set off any "trip wire."
Heck, they try and pass another Brady Bill and we'll start picking off the low hanging fruit.