If anything could take the place of the original yoke, they wouldn't be so coveted by so many.
I've played with the trackball and with an analog stick. Both will let you blow up a DeathStar or two, but neither leave you feeling very satisfied.
By today's standards, nothing about the title is all that awe-inspiring. Shoot-tie fighters, shoot towers, shoot stuff lining the walls of the DeathStar, rinse and repeat. But what still makes that title worth coughing up 50 cents for is the experience the original control brings with it. No other control has ever allowed one to have almost instantaneous pinpoint accuracy or allow you to fire faster than you could if you had only 1 button per hand. It's a fast moving game that requires an equally accurate and fast-moving controller.
In short, the game just ain't the same on anything but the original (or something that functions much like it)
RandyT