I don't doubt you at all - but I do think MoA is certainly an anomaly, as it's almost an amusement park in terms of attractions and draw. The shift towards entertainment "destinations" is certainly interesting, but again speaks to the fall of walk-in retail centers. As you say, most of your enjoyment came from actions far removed from the traditional shopping experience most of us probably grew up with at the mall.
Perhaps the indoor mall is more preferred in the northeast where I've explored most, as the cold winters and humid summers make it a preferable destination.
Then again, outdoor Santana row clones are also popping up everywhere, both in the northeast and in more temperate locales. Personally I think they're all doing quite well.
I don't know exactly what marks or causes the split, but it's very much there to my eyes.
I think it's because shopping is now an experience rather than a necessity: people go to mega-malls to eat out, see a movie, and have a look at shops where they may or may not actually buy anything. Large chains can then use their megamall-based shops as showrooms/customer-care contact point/"prestige" destinations. You only need one or two per city, of course, so they close smaller shops elsewhere which acted as anchors in smaller malls or retail parks.
eCommerce is increasingly centralising retail in the way IT centralised distribution 20 years ago. This is also why a lot of UK small towns are suffering (they are, in the end, primitive shopping malls).
All in all, it was a fun day and it had nothing to do with shopping. So I guess my point is that you might be able to show me that online is eating brick and mortar shopping stores, but that doesn't seem to be stopping folks from going to the MoA or from building an expansion[3]. Seems that larger malls are transitioning into tourist attractions, though MoA probably always was. Honestly I would never drive to the suburbs to an open air "commons" (because Amazon Prime). But I certainly would drive to MoA to check out the Apple Watch, see the sharks, and eat a really nice dinner.
[1] http://en.wikipedia.org/wiki/Nickelodeon_Universe [2] http://en.wikipedia.org/wiki/Sea_Life_Minnesota_Aquarium [3] http://www.startribune.com/ground-broken-on-325-million-mall...