I’m looking forward to all solid-state storage. Flash or otherwise.
No moving parts. No bearings to fail. Much lower power draw.
I’ll be all over it.
Not to mention the instant start up.
Just give us a FW800 port so we could plug in external HDs for special needs. Owners of a thin, rugged MacBook with 32G flash HD might well buy several external disks for different needs. Say, one for a set of virtual machine images and one for archived media.