>>11745219Now's not the time? On the contrary...
When Gen II was released, Magnemite & Magneton were given the Steel type, when they were previously pure Electric. Part of that of course was just because it made a hell of a lot of sense, their bodies being metal. But it would also have been done because it was important that they had sufficient numbers of Pokémon with the new types. So here's the problem. We have significantly more Pokémon today than we did in the Gen II era. Steel and Dark types were only a very small proportion of the number of Pokémon available back in Gen II, but even if a new type or new types are introduced in similar small proportions, the actual number of Pokémon they'd then need with that type would be a lot higher. Doing that, while still adding new Pokémon from the existing types, would be very limiting, to the point where you might not be able to have many Pokémon at all from the existing types. So, if they were to introduce a new type or new types, they would need to add them to a bunch of previously single-typed Pokémon. Depending on the circumstances involved, they may even need to outright change the type of some existing Pokémon.
That sounds like it might make a new type next to impossible, and indeed, it will be very difficult to add new types with those sort of constraints. However, that's not necessarily an argument against new types being added. In fact, the argument could be made that it'd be better for them to add new types now. After all, the issue of numbers isn't going to go away. Unless they're willing to take fairly drastic measures like having all new Pokémon be of the same type, or retyping dual types, it's only going to get harder and harder for them to introduce new types as each generation of game passes.
TL;DR - If now's not the time, then it never will be. It'd be hard enough to add a new type or types now, waiting another generation could make it truly impossible.
