Can an SMPPS (Shared Maximum Pay Per Share) pool be hopped?
SMPPS and ESMPPS (Equalised SMPPS) are "hoppable" only in the sense that they don't explicitly punish hoppers. They are resilient against the prevalent style of hopping but they do nothing to lessen the gains of users who hop away. For this reason, SMPPS (and ESMPPS) are considered "fair" algorithms by hoppers and pools using E/SMPPS are often chosen as "backup pools" to be mined at when no other pools meet their specific criteria. Algorithms like PPLNS (Pay Per Last N Shares) punish anyone who isn't a 24/7 miner regardless of when or how they choose to hop in/out and so aren't even viable as backup pools.

In short, it's not realistic (to my knowledge) to say that SMPPS could be in any way gamed by pool hoppers. They are, however, fair to hoppers who choose to use them as a backup pool and so many who are staunchly anti-hopping still consider SMPPS to be bad/inadequate.