they'll stick with the tungsten simply because it's paid for & it's cheap. try figuring out how much it will cost a studio to upgrade to HMI lights, from a stable of mole-richardsons or arri's, and it wil become apparent pretty fast (I know--been there/done that). tungsten's not going anywhere anytime soon in terms of studio work, since it's also a great source for digital, and video--multimedia etc, where everything in the commercial world is headed. I think we'll be using our moles & lowells longer than the speedotrons to be honest.
EPY, EPN--they seem like old-fashioned films compared to the newer stuff, but they're the tools of the trade for product, architectural & furniture work. anything for accurate color repro.