Base value for a triple axel is currently 8.5.
8.5 + 8.5 = 17, times the sequence multiplier of 0.8, gives 13.6 points in base value if both jumps are called as rotated. (I had some doubt about the second one.)
Then if the judges are impressed enough to give an average GOE of, say +1, it would net 14.6.
A little better posture and absolutely no doubt about the rotation on the second jump, and +2 might be more likely, given the wow factor of that first huge jump and the fact of two such difficult jumps being combined..
Obviously if the second jump is called as underrotated or downgraded and the judges reflect that in the GOEs, the total value would be less.
The sequence multiplier is the real killer.
I think under the current scale of values with the current jump sequence rules, this sequence would only be worth doing for a skater who can do the sequence well (small risk of downgrade), can also do one consistent quad and wants to repeat it, but is not able to put a triple jump as the second jump in a true combination. And that's unlikely.
Otherwise, a skater who wants maximize his triple axel points by using it as one of his repeated jumps would be better off getting full base value for both of them by doing one solo and one with a toe loop on the end.