We've already asked our devs if they could cut training time by 50%, or allow 2 queues for each Unit type (Offense and Defense), etc.
The answer was very clear - no. And one of the main reasons is that it still wouldn't be enough. It would still take years to rebuild 10 millions, and it would still take months to rebuild after a major loss.
The only solution that would make players happy is a drastic training time reduce, and we are not ready to implement it. Our game works differently, and it has always been like that. When you started playing this game, training time didn't take seconds (Well, except for the tutorial Units), and it shouldn't take seconds now.
There are no actual reasons for our developers to change training time drastically, except for the complaints coming from players, that have major losses and want to rebuild fast. But if you want to do something fast in this game, you can use boosts (you get a lot of them for free, remember?), Drachmas (You also get them for free, you don't have to use in-app purchases).
However, I see that cutting training time is very important for you, so when we have the next meeting with devs, I will raise this suggestion again. However, don't forget that last few times their answer was "no", and I don't think we have good chances to hear "yes"