Apple's consistently demonstrates that their most important customers are their shareholders. They are experts at walking the line between maximizing profits and alienating their regular customers. If they felt that a modular computer would have a higher ROI, they would be all over it.

Honestly, I would not be surprised if Apple 'invented' the idea of 'integrated dongles' before their next keynote so they could sell you a $95 usb 2.0 port.