I was thinking the same thing. Why not supplement with an external HD to capture footage to, which you can bring along every couple of months when you need it? I wonder if the Time Capsule can serve your purposes? It has a USB port.
Glancing over the specs for the Canon HV30, it seems that they include a USB cable but no firewire. So I wonder if that is how you transfer data. With an SSD drive, I don't think you'd have any speed worries. Storage issues can be dealt with via an external drive. Your PB probably just didn't have the computing power to handle HD. This new chip will be several times faster and stronger than the PB's.
I just can't imagine that this computer cannot handle the kind of consumer-level photo editing, light video editing and other basic tasks it seems that you intend to use it for. I suspect the naysayers have more intensive, memory-hogging tasks in mind that what you're talking about.
Frankly, it sounds as if, as someone who travels a lot, the idea of an extremely portable laptop is highly appealing. You've probably got your encased cello or oboe in one hand, and an overnight bag, plus maybe a garment bag over your shoulder for your tux. Shaving two or more pounds off the weight of your hardware would make a bigger-than-others-may-realize difference in your comfort level (and for the long-term health of your back). Am I in the right concert hall here?