Excellent points. I was in middle school in the USA when the Gamecube released, and I remember there being a strong focus among my friends and myself about how powerful each console was and how they pushed graphics forward, especially with 3d models.
It seems that Nintendo wasn't focused on this aspect with the Gamecube, and their sales likely suffered because of it. But as you said, we can look back now and see that they had long-term vision instead of chasing the current craze.
It's interesting that Nintendo is in a similar boat with the Switch, but I feel that public perception of the importance of graphics has decreased so the Switch is able to thrive.
I prefer the aesthetic of vertical. There's just something about it that makes it look like a "proper" collection to me. Of course one downside is that it'll definitely mess up the components if they aren't in baggies or some type of organizer.