So therefore no video editor would use a MacBook with the your logic of "No Firewire= No Video Editing". No serious video editor would use a Mac Mini.
So you have an XD Cam and can't afford a MacBook Pro? The Mini is not meant to be a powerhouse, nor very rugged. It's an entry level desktop and most entry level users have no need for firewire, that's why they took it off the MacBook. Apple can save money + space by doing away with firewire in the entry level target audience.
What about the iPod Shuffle? No screen, and it still sold like hot cakes. Apple knows how to skimp and make it look like a groundbreaking product. They can slowly take away functionality and profit from it.
I wouldn't imagine there being a serious editor planning to use a 13" screen to edit with in the first place, of course its possible to do so but hardly desireable, but concerning firewire, any editor wanting to do more than just edit home videos will want to use a firewire connected scratch disk at the bare minimum, i don't know any single editor that uses a USB drive unless they have no other choice, not even to edit DV with. I personally see the new Mac Mini being a mini revolution in the world of Final Cut, we'll have to see how much RAM the Mini will support, but with the 9400 and at least 2GB of RAM the specs of the Mini will be more than enough to natively edit HDV with and most uncompressed SD formats and some flavors of HD like XDCAM 35, or basically any format if doing an offline, but with it being able to support 2 monitors then it more than fulfills the basic requirements for a useable editing workstation and for those who can't afford mammoth monitors. With the mini having FW800, its also clear Apple are aiming it towards creative professionals not just ipod users, and that it will be a genuine alternative to those who don't need the power or have the space for a Mac Pro, and don't need the built in display and inherent markup in price of an iMac, but still want something that runs Mac OS out of the box to do serious work with and still have money to pay the rent. Having something be defined as a 'pro' device, doesn't mean it has to be expensive, 'pro' just means you use it to earn a living.
I myself do have a 17" Macbook Pro, but i travel abroad for work and with the strict luggage enforcements and the low budgets i work with, i can't afford to carry my 10kg broadcast camera as hand luggage along with a bulky laptop (thank god for the Air!), i'm lucky if i can get through with just my camera, and true it's no toughbook but i would consider a Mini far more rugged than a laptop, and would gladly throw it into my suitcase and check it in. I could daisy chain drives to it via FW800 and operate a mirrored raid to do backups, and i could either use the hotel tv as a display, or any variety of broadcast monitor or TFT screen i usually have at hand. This is just one example of how the mini could be used in a pro environment, i could think of countless others, its going to be pretty powerful for what it is size wise, and i don't think i'm out of order for prematurely considering it a little powerhouse, it is going to be a similar spec to the Macbook, which is already pretty close to a Macbook Pro, and that IS a powerhouse.
I think the iPod shuffle is different to the case of optical drives, its a gimmick item and it didn't cost a small fortune so lots of people (including myself) brought them on a whim, and to be fair it is pretty revolutionary, i've yet to find a smaller mp3 player with better capacity, battery power, as well as build quality. But i know many people who will remark about the Mini "it doesn't have a DVD drive? well forget it, how else am i going to backup and share the films i downloaded off bittorrent? I don't care if its cheaper and more practical in the long run, i don't want to pay for a separate optical drive", and no amount of Apple hype is going to downplay that omission to the general public on a desktop machine. I would personally like it taken out for selfish reasons, in that for the occasional time i use an optical drive i would just plug one in, just like how i plug in a printer, and i would in return appreciate the slimmer enclosure and lower base cost, but if there was the option to have it taken out and have a hard drive fitted in its place and run a RAID through Disk Utility, then i'm all for that.
