There is no reason to fix a nonbroken formula. They aren't going to make major shake ups to the series.
The only thing Pokemon may do is go a fully open world game or how Elder Scrolls handled it in Oblivion and Skyrim where major cities are other zones. They aren't going to make more changes to the main series. Turn based battles are here to stay, they push their VGC style battling in the last two gens too much to discard that now.
They may stray away from evil teams, gyms and other plot related elements but the core of battle, capture and progress isnt going to change. Look at the mix reaction to the Let's Go style catching mechanic, some people liked it others hated it.
Pokemon is not a series know for shaking anything up too much. They tend to stick to what works.