I'm sorry, but if people can strengthen the Aedra via "myth". They could do so for the Daedra. They are the exact same. The Aedra just created mundus. And, and this is just my opinion, Daedra are more commonly worshipped. The Aedra are only worshipped by the Imperials and thier pals. The Mer and a large portion of men worship Daedric Princes (though often in secret).
And I've never said Akatosh is weak, he just isn't as strong as a Daedric Prince. Unless the lore has lied to us (which I believe we were told wouldn't happen - though it would be nice if it did, imo), the Aedra are weakened by the creation of Mundus.
Other than that one voiced rumor in Oblivion that says Daedra worship has become prominent/prevalent in the Summerset Isles, and the Temple in Morrowind, I'd say most Elven races worship the Aedra more. Even the Altmer worship Y'ffre, Auri-el, Stendarr, and Mara.
If anything, I'd say the Daedra are mostly respected out of fear, seeing as how they are known to interac with the mortal plane, speaking openly to people and depositing relics every now and then. The Daedra are tangible and through their appearances, mortals know and respect their power.
The Aedra on the other hand, are respected as creators and teachers. From Yokudan to Atmoran mythos, the Aedra are revered not for butting in from time to time but for being progenitors and forerunners, teaching the mortal races secrets for survival and gaining power. The et'ada too, servants of the Aedra (please, dear God correct me on that if I'm wrong) act as the tangible guardians, stepping in to lend aid and save the day.
No, I'd say the Aedra have significant power. They just choose not to use it.