I would not mind playing a distant past game, but first I want to see the current plotlines resolved. Will Solas's plan go through, whether we stop him or not? Will we choose to bring back all the magic, or quell it forever, crushing the wonders that once were? What will become of the elven uprisings? Will the qunari regroup and make another strike?
There are too many questions to be answered for Future-Thedas, for me to want to go into Past-Thedas, just yet. And I suspect that whatever the final game brings (one or two more games left, I think I've heard the devs say is the last one they have plot for), it's going to either leave us with nowhere to move forward to, or the Dragon Age will be over and we'll move on to the next age. Griffon Age, anyone? I'd totally go for Griffon Age, if it meant I could travel Thedas on the back of a griffon...