"New game" new meta.
Why is the duo lane still bottom? There have been some pretty big changes this pre-season and I am starting to wonder if the old meta still comes out ahead.
Why isn't the duo lane going mid now? The advantages are pretty big. The biggest advantage being that with the duo mid you have easy access to both dragon AND the new rift Herald. If your duo has any advantage mid (or if the other team is doing solo mid) you can push out the mid lane and go 3 man Rift Herald easily with jungler (or 4 man with top) before the other team has a chance to respond. Then you use baron empowered minions in the midlane to take the tower, and since the new game is very snowbally you can quickly move your "mid duo" top or bottom to take another tower and win the game. This advantage will be even bigger once the winnions change hits in 5.23
The only disadvantage that I see for doing this is that your "mid-laner" suffers because he is easier to gank bottom and no longer has easy access to blue. But there are a lot of current mid-laners who have safe wave-clear and decent escape, and there is opportunity to "cross-map" now.
Whether or not this strategy actually is better then the current strategy of sending the duo bot it still brings up a big question. What would it take to change 5 years of players running the same meta with small changes to what champions go to which spots? Is there even a set of in-game changes that will alter lane assignments?