Is the scrollwheel an endangered species?

Is the scrollwheel a dying accessory? What was once a brilliant innovation in computer mice looks to have replacements creeping up behind it, at least if you consider the new influx of mice to be innovative.

Take the Traveler 515 Laser mouse, for example. Rather than coming with a scrollwheel, it has a touchpad instead. This allows you to scroll as fast or as slow as you'd like without messing with a wheel. Is this an improvement? It's tough to say; I'm so used to my scrollwheel that this new function would be pretty jarring, at least at first. Although not having to clean out the wheel when it gets gunk caught in it does sound like a nice change.

Everything USB, via Ubergizmo