@Troy ill give you my opinion on the server. Taurus isn't dead or hugely active compared to Aries but there is still plenty of people on and it is a growing server once again. Players are no longer greedy and people are willing to do your rb/js/ds and sometime fb for free since they would want to test their team now or just bored. This probably applies to all server cause of dupe now.

Don't plan on coming back if you don't plan on duping. The game was way dead before it happened and in my honest opinion, the duping made the game active again.
You can try moving to Aries but you will most likely get an error since it is full. But you could see old players if you revisit Taurus.

Sure duping is wrong, but when you got a publisher that don't care much about this game and years without any major update, then i dont see any problem. I would only care when IGG actually does something about the dupe but they don't. Do as you want.