Yeah, but to what extent is that because the other franchises are held back by being on less successful hardware?Regardless of being a portable or not the biggest factor in the success of the Switch is Nintendo's own software.
They sell almost literally 10 times as much software as Bandai Namco, the second biggest publisher in Japan.
They have several IPs that are bigger than Monster Hunter and Dragon Quest.
What if Japanese devs released their biggest and best games on the actual winning hardware (DS, 3DS and now Switch)? Eg, the highest selling Dragon Quest is on DS. The last time they focused their prime efforts on the system that was actually winning was the PS2.