can we mic all the instruments and vocals directly in the console then plug a 4track and record all the sounds on one track?
Sure but its not the best way to do it...
Your goal in recording is to record each instrument on its own track, that way if you have a part you want to add reverb to, (like vocals) or if you must adjust the level of one instrument in editing you can.

Once they are all mixed down to a single stereo track its next to impossible to edit each part so you better get it right the first time.......

BTW this "console" you are talking about is a mixer...just so nobody is confused about it.