April, for better or worse, is probably the EARLIEST that things would go back to normal ... so we'll see.
That, of course, depends what "normal" you are looking for .... everyone is different what is currently missing from WDW right now. Some just want firework backs, other want M&Gs, others just want more hours.
I'd suspect we get back things in phases .. slowly .. rather than a "grand re-reopening" date (even though that would be exciting). And some things may not come back for years just due to trying to save costs.