I think it'd be great as a mobile title. Don't know if it's a good choice for the Switch though, I feel like it was rather light on content to justify a $40-60 price point nowadays. I'd rather have a new Tomodachi Life on the Switch.
Yeah content was the biggest problem to over come if a new title were to come to Switch, I tried to list a few ideas that help expand the game but I'm still not sure it's enough to justify. The 3DS game felt very similar to the original, if they are going to do a non-mobile title they'll have to try and change that and do something new with the concept as best they can.
I think the main draw they'd go with is that, this would end up being a rare title were Nintendo tries to push realism and graphics first.
Tomodachi Life is another title I hope comes to Switch as well, but I'm greedy and want both