Some NASCAR guys would be super-pissed. They have mini print labs in their vans selling fresh photo prints right in the parking lot. They'd have a high end Mac for production/printing. That Mac has to keep the wide format printer's buffer full so the printer never stops because, if it stops, there will be a slight loss in quality because it has to wait for the buffer to fill so it can resume. He wouldn't be able to produce his photograph while the previous one is printing. Does he need to grab another mid-range Mac, find room for it in the van, and dedicate it to the print jobs? Time is money here. The more he prints in the time people are willing to wait in a parking lot is very important.
Before the x86 move, this was not always possible. It could be linked up via usb 1.0/2.0, firewire, or ethernet. There were the fiery rip stations, which were just low-end boxes dedicated to managing print jobs. Then the option was to buy a decent iMac, and use fiery rip software to turn the iMac into a dedicated print job manager. Already you see moves in the market to encourage people to buy multiple Macs and go with software instead of dedicated hardware.
Macs finally have the juice (Intel) to get stuff done in short order and with thunderbolt, you'd have such a nice wide highway to your peripherals. I can't see anything from ARM's or Apple's R&D creating a chip that can compete in the high-end market. It's already really expensive, but then again, if you are selling prints for $50 - $75,000, buying ink for hundreds per cartridge, and rolls of paper for hundreds as well, you want to get it right the first time and as fast as possible.
Why do I even care? IDK, I'm a PC guy. Sorry for rambling.