As much as I would love to see johto being implemented, there is far more important stuff to do for the devs.
Johto as region would only add content for like 20 hours of playtime, which is not worth the work put into it. Without offering anything else than story content, it will not help transforming casual players into long term players which should probaböy be the goal for now.
A new daycare is also hardly a resaon to implement johto, because right now we`re getting eggs back directly after leaving the parents there, which doesn`t leave any incentive to use multiple day cares simultaneously.
Legendaries are probably going to be added in legendary dungeons but johto is not necessary, as these dungeons could be in any of the regions already implemented.
As for crafting pokeballs this could be an interesting feature but is not really super important.
Don't get me wrong, I hope some day we are going to see johto, but before I would actually like to see complete gen 4 & 5, as well as the rumored PvE late game content.