No, they are putting all their resources into catering to both. They are making a game for the people who bought their cellphone product and made them more money than they did with their core fans, so that they could bring them over to a new system to spend more money on more Nintendo properties. Then they went out of their way to announce that they are also making a core game for the Switch that will be out during the second half of 2019. So it's literally the best of both worlds.
This.
Besides, didn't X/Y arrive more than two years after 3DS launch? The traditional Pokemon title is still on track to hit that target on Switch. Literally what is there to complain about?