If trump goes baseball bat-to-kneecaps to the people at the epa, plus Stellantis is looking for a new CEO with how bad what's his name has done, there is the possibility for some real change.
Hurricane standard for the 1500s and if they keep the 5.7 then have the option for that as well. 2500 and up come standard with the hemi, be it the 5.7 or the 6.4. Probly unlikely, but a boy can dream.
Engine block molds have been removed from the casting rooms, machining fixtures have been taken out of the CNCs, etc etc. While they aren't set up to run any of the hemi engines, I bet they still have all of those things stored in a warehouse somewhere. Every company I've ever worked for has stored everything for decades before throwing it away.
I'm sure some things were tossed or converted for use on the hurricane lines, but with MILLIONS of dollars in tooling, I can't imagine it all went from active production straight to the trash can. At least in the firearm world, manufactures will wait a while (years or decades) and then sell that old tooling to third party companies to make aftermarket replacements. That may not be Stellantis's plan, but it's still possible they have it.
Setting back up would be difficult, but I doubt it would be a full restart.