But the Mac Mini is still selling, isn't it? It's still successful, right?
Then purchase the consumer version. Another easy alternative would just be for Apple to provide a CTO version to choose the Mac OSX client for the drive-less Mini. Actually, this would be an easier route that could please all audiences.
I think it would be worth it then to see some statistics on how much of the masses actually use the optical drive today in 2011 and any predictions and analysis' of future use.
If the Mini were to begin adopting the onboard flash memory that the Air utilizes, I think what you propose with keeping the optical drive could still be achieved.
Regarding your last statement though, we're talking about Apple here. Do you honestly think they are going to make the Mini bigger?