15 minutes are enough to get between gates at DFW. So then it comes down to the question of whether you think your flight will be on time. Absent terrible weather, a fairly early morning flight (which you will be taking) is very likely to be on time. And if the weather looks terrible, you should be able to call AA to switch to the earlier flight the day before.
If you do miss your connection, the worst case scenario is probably that you fly via NRT or SFO/LAX and arrive later the same day. Not terrible.