Bohemia Interactive is no reliable and trustworthy partner. They change stuff, interfaces without prior warning. For the average modder who is usually a computer science student with too much time this is no problem because the love to code. I am a high paid freelance IT professional -- for the time I develop stuff for DayZ that does not work because BI changed everything again with the next patch, I can earn several thousands of Euro. As long as I was on the hypetrain it was kind of a hobby. But frankly I lost most of my trust in the Devteam. And we were (and Aim still is) in a private FB-group with Eugen and Co since 2015. If I would get a dime for every promise Eugen made and then broke I would be rich.
The only way I could imagine doing Oldschool again would be if DayZ had the same maturity as Arma 3 (with editor and stuff). Doubt that this will *ever* happen.
There is a saying: "Don't ride a dead horse." I fear DayZ is a dead horse. Just look at Steamstats and Twitch-Viewer-count...