Jesus Christ, the banshee isn't some fucking flying juggernaut capable of blowing up the Earth.

...at least, it isn't when the people on the ground have some iota of skill and/or high explosive. :v

But seriously, banshee's staying in according to WoL. If you don't like it, simply change your gametype setting to not include the banshee. This isn't like the XBox version where you're limited to all or no vehicles. :v