Warwick is a decent laner. It isn't required to Jungle with him. But then again, it isn't required to play Ashe as a solo carry, or Morgana as a support. All of these characters excel at a particular role and not playing that characters specialization is detrimental to your playing and the team's performance.
If you really enjoy Warwick, take the time to learn to Jungle effectively. A good jungler is so beneficial to your team, allowing both your carrys to solo (since there is always Ashe + another) and coming out to surprise secks (read: rape) other champions.