True, but the mechanics could be changed. By getting the Champion reward from one of the gods, you wouldn't be able to get another one from any of the other gods - and perhaps other gods' happiness would drop. Nothing as severe as the once-proposed "crowning by one god only" idea, but a small penalty nonetheless. Oh, and of course, you could only get the Champion gift once.
And if we talk about an increased prayer timeout, the gift should be something really nice to justify it. Certainly not 3 days, though.
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Atavus's Armor is better...but you still can't pray to him for 6 hours.
He doesn't do much else, now does he?
(if my calculations are correct, it takes roughly 3 hours for prayer to be safe, so 6 hours aren't THAT bad either)
Ps. Another idea: Make sacrifices decrease the time until your next possible prayer (I can't really tell if anything like that exists now).