Nothing wrong with offering both. Within a few years it'll probably be nigh impossible to buy a laptop (and possibly even a desktop) without a touchscreen coming standard. I'm looking forward especially to having high-end tablet/laptop hybrids that also include active digitizer technology so I can finally have the lightweight portable digital sketchbook I always wanted.
Er, haven't they been making those active digitizer convertible tablet/laptops for years now? I even had one.