There are still 4 minivans on the US market, and really I don’t think there’s space for any others to sell successfully. The ones that exist are damn competitive for what they are, and they still don’t sell well.
Oh I don't really disagree. The Sienna and Odyssey seem like good vehicles. I'm less familiar with the remaining American(?) models.
I also don't know enough to meaningfully speculate why 3-row SUVs took over from minivans for fairly similar use cases even though they seem less effective in a lot of circumstances. Part of it is probably image--especially for some male drivers--but I lack the data to have a strong opinion.
It was pretty funny 20 years ago before this was realized- big SUVs had low range transfer cases, skid plates, lockers, air suspension, and tons of other expensive and complicated offroad hardware. The people buying and driving these had no idea what those parts were for, and only found out they had them when they would accidentally activate them on pavement and get an expensive repair bill.
Unless you're looking at an expedition or the like, they're all unibody, front wheel drive, and turbo charged inline fours. Just like a minivan.
The SUVs of old had a truck chassis, a large V6 or V8, rear wheel drive.