it doesn’t matter what notifier wants to do, johnson will keep their existing customers. service may get a bit trickier if notifier won’t sell them parts anymore, but they’ll make do. they can still service the systems, and can easily hire a notifier distributor for small work.
johnson is a controls company, they put in fire alarm when needed but would be fine if they never ever had to deal with it in the first place, and the controls contract is 10x whatever the fire is. this means johnsons customers want them for their controls, so nobody is going to easily be taking the fire portion away from them, they’re just too embedded with those customers on the controls side already. there’s a good chance you even start to see notifier panels replaced with simplex, although the reality is it’ll take years for those two companies to become fully integrated.
that’s all purely my speculation. if notifier does drop JCI and you’re a distributor, your best bet is to call up JCI and get in their good graces and offer your services directly to them, not their customers.