I think that's a pretty neat idea, except that it may cause some unneeded stress on the servers in the instanced zones without having enough practicality to make it worth it. It sounds fun, and could maybe be a great tool to teach fellow Linkshell/Free Company members how to run an encounter for the first time without having them actually enter, but otherwise I don't see much of a purpose for it. Maybe if we had ranked PVP matches people would want to spectate those, but that sounds like what the Coliseum is for.