The bottom line is that you wont want all your card draw in only one of the colors in a typical multicolor EDH deck, so finding a few red draw staples helps make your decks more consistent
Regardless, I dont know that now is the time for more than 60 cards, but I do know that as the card pool expands, it gets easier and easier to find more spells of a similar power level, but no other lands are close to the power level of fetchlands, so the incentives to build to maximize the power of our lands over the power of our spells do increase in some way over time, which is to say that, even if its not right now, it could be someday, and getting there first might be the best way to truly break Modern.
Im running two Twilight Mire
You may put that card on the bottom.) Illustrated by Zoltan Boros Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
There can also be too much of a good thing in this category do not take this deck building step as an endorsement to replace all basic lands in your deck there are plenty of cards that can prey on you for pursuing this route like Back to Basics, Ruination, and Price of Progress