We tried the referendum with our Assualt Weapon Ban and couldn't get the needed signatures. Most people don't know/care. I'd really like a state with a lot lower population. Less people, less twits.
Gun control bills only face intense opposition from gun owners. And gun manufacturers and gun shops don't have enough money to fund a referendum.
But this legislation draws opposition from many big-money sources, such as vehicle manufacturers, trucking interests, auto dealers, many unions, chambers of commerce, etc., etc. They can afford to hire the political consultants and pay for the signatures to force a referendum. All it takes is money, and they'll either pay a little now or they'll pay much more (by about three orders of magnitude) later.