Dave, I'm surprised that you, who works in the design field, with styles cycling all the time, don't think that vinyl will bounce back in some way. i don't think it will bounce all the way back to its former glory, far from it, but i certainly think it will either level out or even climb back up a bit.
Doing typography by hand or design outside of the computer hasn't really bounced back yet you know

Vinyl will never totally die out, but I don't see how it can be the dominate media ever again in this scene. Even in audiophile circles it's not dominate.
You have to understand, I'll looking at this more from a practical and tool perspective rather than style. The CD replaced vinyl. The CD replaced tape. The mp3 is replacing all 3 and society will not be going back.