Personally I'd rather see relic spend their time creating new content like new armies and free commanders. Eventually I'd like to see this feature implemented but it is not something that relic sega will see a roi on and thus is probably near the bottom of the list. Just being realistic here. They are aware that ppl want lobbies also.
Hard to say wether it would pay of or not. On one side it would probably attract those people who dropped this game because of the lack of basic public lobbies. On the other, Relic did a really good job hiding this until release, and they did let people believe lobbies were on theire way after release, so those people might have bought the game already only to have it gather dust.
I do believe however that lobbies, with support for custom maps, would be a more cost efficient way to keep the game alive with fresh content, than regulair release of commanders. That always fealt like a way to cover up other shortcomings to me.