No, its still going to work, but I think its not a bad thing to examine your work flow, and given Apple's prior history, its probably a safer bet to jump ship. At least I am but YMMV and there's nothing wrong with sticking with Aperture until things are a little more defined.
I don't know of any published C1 roadmap that addresses functions that are common in Aperture and LR and seem to be missing in C1. I would love to see one. I would love to hear Phase One say they want to go the market where products like LR and Aperture have dominated.
I like much of what I see in C1. But it is missing too much for me to seriously consider it at this point. The proverbial ball in in Phase One's court. Now is the time for them to step up, if they want to address the wider photography marketplace. I for one would love to see and hear that happen!