Very Intresting thread,
For me, when I get to be PM, I would still want to be SCEA, even if I don't display all my knowledge ;)
RUP mention about various roles, as per RUP PM & Architect are different roles altogether. In anycase PM has enough to do. Many organizations have Technical Manager role here PM&SCEA will be a good fit. In fact i was dilemma year back whether i should opt for PMP or SCEA and i opted for SCEA since i have arround 9 years of experience and i was not willing to jump into PM to early instead what i opted for RUP which will make me more aware of different vagaries of Software Development
As per me it will put recruiters in more dilemma
if they see both PMP & SCEA in ones CV,
its better to have SCEA+RUP kind of combo instead for marketibility purpose