There's no reason the MBP shouldn't be usable as a "portable entertainment system". Every other laptop is, even HP's powerful mobile workstations play (and burn) Blu-Ray. All the hardware is already there, except the drive and the hi-res screen. Hell, the current MBPs are basically crippled mobile entertainment systems (since they offer media playback, but not at FullHD resolution.
Apple could easily offer us the best of both worlds, and I have been saying this repeatedly in these debates: give us the option of choosing between an MBP with an optical drive - but make it Blu-Ray, since nobody has any use for the Superdrive - and an MBP without any optical drive at all. Then people like you who don't care about mobile entertainment can happily choose the driveless model and people like me can choose the one with BR. Currently, NOBODY is happy: you have no use for the Superdrive, because you're not interested in watching movies on your laptop, and neither do I, because it doesn't play BR.