To actually answer your question this time though (since I realized I didn't yesterday), yes, I think it will be a mess if they try to do fireworks anywhere but Epcot. But they shouldn't even try Epcot right now with how bad COVID is spreading around the country right now. It would just be a terrible idea imo.
What I think they may be planning for is NYE fireworks, which, as a one night only event, I can give them a pass on.
About the fireworks, I wouldn't get excited. It's being said on Magic that they were taking advantage of the rare downtime to upgrade the launchpad at MK and they simply wanted to test the new equipment out. So far, I haven't seen any fireworks.
Fireworks currently testing in short spirts:
In the past I used going to Disneyland at least two times a year, and enjoyed very much those trips there. But after several years, I started to feel bored of going there. I wanted something new, and I started to search for interesting places around the world. And I found my new passion: the mountains. I found beautiful hotels on this site Bluehouse Skis - The Best Tips & Guides on Snowboard, Ski & Snow, and since then I go to mountains every year. So sometimes is a great idea to change the perspective, and try different thing. You never know, when you will find a new passion for something else.