not at the moment, and this wouldn't of course stop such things from forming.
Except we'd see not 50 people from a single guild at an op war, but 10 people each from 5 guilds which are in reality all the same guild.
It'd just mean even more alt guilds, except they'd be loaded with players as well as storage alts. Coordination would be a bit more difficult (as there'd not be a unified guild chat), but with custom chat channels that's easily overcome (and those already exist).
Except we'd see not 50 people from a single guild at an op war, but 10 people each from 5 guilds which are in reality all the same guild.
It'd just mean even more alt guilds, except they'd be loaded with players as well as storage alts. Coordination would be a bit more difficult (as there'd not be a unified guild chat), but with custom chat channels that's easily overcome (and those already exist).