Ooo - so many to choose from:
I agree with most of what has gone before, but mostly:
Wheel of time would be awesome, although they would have to savagely edit it... 2/3 of the books are pretty dull.
I think Eberron would make for a good series - there are a number of novels that I would love to see (if done with a Game-of-Thrones sized budget!)
The Ben Aaronovitch "rivers of London" series would be quite entertaining
Benedict Jackta's Chosen series
And Michael J Sullivan's Riyria Chronicles would be epic!