4 of their last 6 tours have been a mix of arenas and stadiums.
No. They tend to swing more to playing stadiums after Zoo TV but a worldwide arena tour might be a welcome change after 360.
360 and Popmart = all stadiums.
Elevation - vast majority of shows inarenas with a handful of stadium gigs (Slane 2x likely due to demand, Torino and I think the Waldbuhne venue in Germany).
Zoo TV did start in arenas for 2 legs (band were timid how AB would go over) but ultimately ended up playing a comfortable majority of shows in stadiums. Now this was a tour that worked much better in stadiums.
Vertigo was arguably the one true mixed tour, and even then they didn't mix it up during each tour legs; US all arenas/ROW all stadiums. Though with the sucess of Vertigo why they didn't go to US stadiums is a mystery...
Lovetown - arenas.