Well, that strongly depends. I personally don't care about 4K, as I don't have a 4k output device yet. I might be more interested in more power to improve frame rate and/or resolution on existing games. But people generally forget the main reason the New 3DS was a hit: it had a second analog input. That made me buy new 3Ds instantly. If Nintendo improves the value of the Switch Pro in a similar way, that would be a much bigger draw than a simple power upgrade.