Pot odds question

[Percussion]

Hero holds 5h6h, Villain holds AA. Villain raises from MP, and Hero calls on button along with two others.


flop comes 472
When can you ever call a pot sized bet?

Lets say pot is 10$. Villian bets 8$, and since your open ended straight draw is now getting better than 3-1.
With two cards to come, this is an EV+ call. Now, the villain will most definatley bet the turn. How can this be a profitable call if you miss the turn? He will surely bet 3/4 of the pot (he is TAG) giving you incorrect odds to call on the flop.