I haven't heard whether the $1500 license fee is final and the same for all dealers; whether it is an annual, recurring or one-time fee.
My take from the linked article is that the state license fee is $300 (which is what they say they are going to charge FFL dealers who do not have a storefront), and that the cost of the "upgrades" required for those that have a shop will be approx. $1500 (cameras, anti theft system -what ever that is?, etc)
SO, assuming their estimate is correct (and I doubt that) a shop would need to spend $1500 in "security upgrades", ( and remember that whatever you get has to be approved by the state) ALONG with the cost of the new state license, in order to comply with the new law.
Also, while one would expect that the cost of additional security items would be a one time expense, it MIGHT not be. It's not impossible that a year or three down the road, the state might decide that your cameras and alarms no longer meet their requirements, and you'll have to replace them with new, approved equipment. That "$1500" or what ever it actually costs MIGHT become a recurring expense, at the whim of the bureaucracy. And/or they could just raise the license fee...
Also, there is the ever present risk that due to a "budget crisis" the state might (temporarily, of course) defund the processing of license applications and renewals. No license, no doing business. Win Win for the anti's.