The 'flix has picked up and renewed the series You and a few others from other networks in the past. If the analytics shows a strong interest in their target demo, they'll green light it......
Two things I didn't consider tho. One is the cost of licensing Halo from Microsoft, (but seeing how well Fallout and that animated gamer show did on Prime) they may value a property like Halo pretty high and Microsoft may want it to stay in production....
And finally the production cost of each episode. There's a lot of CGI in Halo. If they can use "A.I." or creative ways to shoot it without such high costs they may have a hit on their hands