Arsenal wonderkid Chido Obi-Martin could come to regret his decision to leave North London this summer. As things stand, Chido Obi-Martin is almost certain to leave Arsenal very soon. The Hale End academy wonderkid has been unable to agree fresh terms at the Emirates Stadium. After Arsenal refused to improve their contract offer to Obi-Martin, the club informed the youngster that he is free to seek pastures new, with Manchester United now looking like an attractive destination. It will certainly be a blow to see the teenager go. The Danish striker was in phenomenal form last season. Obi-Martin…