A few things i think they have to do to pull this off.
Get with Sanderson, and spend a lot of time looking for areas to trim off tons of fat. Jordan was notorious for adding character tics and what everyone was wearing, seeing as this will be covered in the visual format, no time is lost here.
Cut a Majority of Perrin. Ignore Faile. Perrins story needs to be Defense of Two Rivers, Wolf Powers, White Cloaks, then Final Battle. Make his character progression a bit cheesy, wanting to be strong enough on his own, but learn how to be a part of a pack. Two parallels Blacksmith to Leader of men in battle. Lone wolf to Leader of the pack etc.
Cut out Masema, entirely. Cut out the small scale battles and the weevils.
Axe Aviendah's spirit quests. Make her a simple but important link to Rand and the Aiel.
Cut the political intrigue with Elayne.
Find a way to speed up all of the Tower bullshit with Egwene.
Clean up Matt's Seanchan alliance.
Cut Min. Make her predicitons come from Eladia or something and have that be her catalyst to turn etc.
Should be right around 10 Seasons at 12 1hr. Eps each. Plenty of all aspects that makes the books good.
After cuts are made and you have a definitive season / episode count, write up ironclad casting contracts. If done will yes these people will be come famous a la GoT, but you can't let the salaries blossom into the millions per season over however many actors. Instead offer them incentives on the back end. Also leverage their age most of the characters are late teens into the fact that the work after this will be worth a lot more etc.