Watching these places densify is fascinating but its all for nought if they stop there. Once the density is there, you build a wall of shops, restaurants, cultural destinations, amenities, etc. along these absurdly wide thoroughfares to service the larger population. Surely the last phase of urbanization will be turning these 'highways' into proper city streets with sidewalks people want to stroll along? 15-25 foot wide sidewalks made of quality pavers, heavy landscaping, etc. (No concrete)
Lane reductions on their own is a recipe for disaster. You have to build COMFORTABLE, RELIABLE, FAST PT: subways, LRT, bike lanes, etc. before you take the lanes out. Getting back to my initial point, if all we're doing is buildings tall buildings this whole exercise is a colossal failure. Surely building density is a means to an end? Surely this is not to create more customers for malls and big box outlets? It's to build populations who can walk to the store, cafe, school, work, etc. Or at the worst, its a 10 minute LRT trip.