Honestly, the more I think about it, the more I think it would've been a good alternative in the later seasons. They were one year behind because of the dream season anyway and like Marc Cherry pointed out, soaps can sometimes get too complex and need a bit of a reboot/refresh. Pam leaving the show would've been an opportunity to shake up the chess pieces instead of just trying to keep everything in status quo - of course, they likely would've botched it and just introduced another wife in the place of Pam, but still...