of course you can.
what is not maintainable for any length of time would be 5 and lower. even 6 can be maintained for a great part of the year.
the difference in look between 5 and 6 tho is not as great as the difference between 4 and 6. that is night and day. a guy can be a true 6, carb deplete, water load, use arimidex and look 5 or lower in one weeks time.
the reason however you dont see guys 6 and lower year round is because its much harder to diet down and maintain it after- its the goal that gets met, after that the mental aspect of achieving it is gone, resulting in a breakaway from the plan that got you there. the guys you see at 6-7% year round litterally are that lean all eyar and prolly have been for years. they dont yo-yo. they live that lifestyle.