A way to make AP Ekko more viable than tank?

The most popular builds and winning builds are tank ekko with items. One of the reasons why is because is Ekko is really squishy and blows up before he do combos or dies pretty quickly in teamfights. One idea I saw was to increase the duration of Ekko's W shield from 2 to 3-4. When Ekko goes a lot of AP the he can get a huge shield with the nice AP ratio from it but only for 2 seconds. If the duration was longer he could be able to survive a bit longer. This may make people more prone build more AP as Ekko can do a lot damage and atleast be able to use my W for a mini boost to protect myself. Ekko's W has quite a long cooldown so people will have to use it wisely. I hope to see more Ekko mid but it's been kinda weird to see Ekko just build just tank as his kit can do so much more with AP.