Ideally Watson will become the #3 for Australia in both forms once Ponting retires. If you bat at 3 for Tasmania you are practically opening anyway so he should be fine
The problem comes in if the selectors still see him as an all rounder and we rely upon him to still be able to bowl the full quota of 10. Big ask to bat first at Adelaide in 35 degree heat and then after a long innings back it up with the ball later on in the evening.