Yes. Yes, they can. A near 70 million user base. Why abandon it? With the new 2DS XL, they can hit 80 million.
See, folks are saying,"DROP THE 3DS, GO ALL IN ON SWITCH."
Okay. But the Switch only has a 5 million user base so far. They need time to build it up, otherwise they're abandoning a massive install base for another that will EVENTUALLY be of equal size.
The most optimistic forecast... being extremely generous, it will take Switch at least 3 more years to reach that size of install base.