I'd cancel all but two of my accounts, and just use one account to boost the other, like I used to do back in old Diablo 2 days. Actually actively playing both accounts at the same time? Nope. The reason I've stuck with WoW over other new MMORPGs is becuase WoW makes multiboxing so much easier, and there's good synergy between classes. If /follow were gone, I'd transfer the lvl 70+ toons on my 3 cancelled accounts to my two remaining active accounts and go back to solo raiding with the guild full-time.