Nintendo tends to create ideas and then they see what IPs fit with the idea and since it is hard for new IPs to sell well they just use one of their well known IPs to sell it which is better as it will sell millions plus add a fresh coat of "new" in that IP.
but of course every now and then they do bring new IPs like Pikmin, Wario, Wii something and a couple of other games developed by second parties. I honestly don't want to constantly buy new IPs that I don't feel any "love" for. I want Nintendo consoles for Mario, Zelda, Metroid, Pikmin, DK, MK and so on and whenever there are new IPs from Nintendo I might give them a try to
those who complain probably don't like their IPs anymore or have never loved them