Could a new hire FO go to united via the CPP? Of course. How many years will that take? Nobody knows. It could be a long time. This misses the point though:
The CPP generates movement and movement = better quality of life, a faster upgrade, faster PIC time resulting in a more attractive resume and a faster off the street hire. The CPP is a win for everyone at AW even if it is small and even if a new hire FO gets hired off the street by UAL or SWA or AA or [insert major here] before their CPP number comes up.
For those who plan to just wait out the CPP and hope it works out I think they will be very disappointed. It can be a great way to get the list moving but it's not a career plan. See the numbers I posted earlier in this thread though and I think it will only make a good situation that much better.