There are diminishing returns when adding meta members.  I doubt you would see much difference in performance above 16 members.  I wouldn't recommend going above 32 members.
If the pipe and latency betwen sites are not factors, what is the max size a replicated striped meta can or should be, and please explain why.   Specifically, what would be recommended for replication of a 3TB lun, with SRDF/S, for example.
Best practice for replicated striped meta size - max size?