Riot will never bring back the old 3v3 map. Its the same reason that Magma Chamber was never released. I remember listening to Morello in an interview talk about this with Lyte; if we were to release another 5v5 map (Magma Chamber) it would split our playing community. This would mean longer game queues and a smaller pool of people playing in this specific game type. Honestly I think it's better for everyone that they don't bring back the new map.
And Fraysa, how about you learn to adapt and play the new 3v3 map. It is still in Beta and a lot can change. I love the changes they have made and you even said so yourself in your post here.