I don't disagree with getting the 100% het male. But if he chooses to proove out his 50%er then hes right about the time frame - getting a 100% het female now - even if the male doesn't proove in 2 or 3 years if he holds back the ph male offpring hes bound to hit on one within another year or two. Frankly I'd give it a try (especially if your snake is a pet that you'd like to prove and arent in a hurry) but if the male doesn't hit on the first try - sell all the possible het offspring and buy a 100% het male.
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Tosha 
"Nihil facimus sed id bene facimus"

6.34.0 Ball Python (Harry and Fluffy and gang)
1.0.0 Angolan Python (Anakin Skywalker)
0.0.1 Green Tree Python (Verdi)
0.1.0 Bredls Python (Smurfette)
0.2.0 Feline (Pippen and Pandora)
0.0.1 Desert Tortoise (Pope John Paul aka JP )
2.2.1 Fish (1,2,3,4)
0.0.4 frogs rescued from pool skimmer
0.0.0 Lizards of unknown origin