The correct decision here is to update districts for 4.0
Considering the scope of changes to POPs and an entirely new civilian system (and by the way, are we going to ignore that particular elephant in the room - new strata that currently serves no purpose and devs themselves said they haven't yet zeroed in on what they what from it??) this seems a very reasonable move. Update the balance and numbers and that's it. Yes, we would not be fixing any issues with current building system and we would be pushing the fix into the future. On a flip side, we can iron out new POP system and civilians. And by the time we get these two properly working - then we can start steadily tackling planetary management.
Personally I think they can ship current zone system, with a pretty large caveat of them slapping zones on top of separate buildable districts. The issue is that even players on this thread had a lot of different ideas as to how to better implement zones , I count at least 5 different detailed proposals (one them even my own) and quite a few less detailed ones. Figuring out how exactly to do it, implementing it and having first balance pass on it - that's a lot of stuff to do in a month. All of it to say, it isn't impossible to make zones work if the lead makes the commanding decision to go with some variation on the aforementioned proposals right now. I'm pretty sure they had same brainstorming session in-house so it's not like we came up with ideas devs themselves haven't considered in some form. But then who is to say that this proposed system would be any better - nobody would have any chance of testing it out properly, be it devs, testers or players. It might be really good, it might be okay, it might be ever worse than current zones.
If it were up to me, then sure, I would just go with my own personal version, it doesn't seem to be that difficult to implement both of art or code sides. But that's the thing, this is my own idea, of course I think it is the best thing ever. I'm pretty sure the same goes to other posters in this thread as well. But to actually figure out whether a particular proposal is a good system, the same system or the worse system compared to current actual game version, you need testing and prototyping. Also you need input from real developers so they can weigh in and say what can be done easily, what is difficult and what is outright impossible due to some limitations. After you get this prototype, you get people to test it, to play with it. Not only that, you make prototype for another two alternative versions of rework. Finally you compare the lot and go from there. None of it is possible for enthusiastic players on forums, we can only voice our ideas and try to imagine how would they work in-game.
So, yeah. Better to postpone planetary management rework altogether. Any other way is too drastic and frankly unnecessary. We are getting POP rework and new strata, that's pretty big. Limit yourself to this and players would be happy to reduce lag and add some spice into game. Pour half-baked zones into the mix and you ruin everything for no good reason. Not that it would be unsalvageable, just months of patches, a bunch of negative reviews on steam (for once not from crazed ccp funded morons), hundreds of pages of heated forum discussions and tons of stress for the devs. Is it worth it?