Theoretically on Dec 4, 2018:
Your family of 2 adults, 3 kids (ages 10, 6, and 3) can now visit WDW for 1 day, purchase Early Morning Magic, get a park hopper to check out another park or 2 (assuming you get most of what you want done in MK before 10 AM) for the 1 day price of $1,313,
1 day Regular ticket with Park Hopper:
3 (ages 10+) @ $174.00
2 (ages 3-9) @ $168.00
=$858.00 + $55.77 tax
=$913.77
Early Morning Magic
3 (ages 10+) @ $79
2 (ages 3-9) @ $69
=$375.00 + $24.38 tax
=$399.38
=$913.77 + $399.38
Total = $1,313.15
Not my cup of tea but each family can spend their money however they want.