Hmm.. channels/instances I feel would be pretty cool to keep regardless- At least for the higher pop servers!! And as others have mentioned have a UI display that lets you flip between the channels. RO2, GW2, Terra, Blade and Soul...quite a few games do this and as the population thins or gains during the day the instance adds or drops channels. There is also like a 20Second cool down between channel switching. It also allows you to switch to your party leads channel.

Agreed though, doing a MSQ and then getting tossed in different instances is a little silly. Then having to play the Who is closer to the zone line to switch just to join back up is no picnic.