If Edge is injured, then it is just a minor injury which he will work through. Wrestler's continue wrestling with injuries throughout most of their careers, albeit minor injuries. Maybe Edge fell/took a bump and suffered a minor injury to his shoulder, he will just be careful not to aggravate that injury and will wrestle only when necessary, i.e. PPV's.
If the injury turns out to be serious enough to warrant him dropping the title, it is likely he will drop it to Kane, who could then feud with Batista (able to challenge for the title now Edge is no longer Champ) or MVP (after dropping the US Title to Hardy). It is highly unlikely that Matt would recieve a push to the ME, let alone a World Title run. I fully expect Matt to rise the ranks on SD! and enter the ME by the end of the year, but not at the moment. That's just wishful thinking by a Matt Hardy mark.
If the injury turns out to be serious enough to warrant him dropping the title, it is likely he will drop it to Kane, who could then feud with Batista (able to challenge for the title now Edge is no longer Champ) or MVP (after dropping the US Title to Hardy). It is highly unlikely that Matt would recieve a push to the ME, let alone a World Title run. I fully expect Matt to rise the ranks on SD! and enter the ME by the end of the year, but not at the moment. That's just wishful thinking by a Matt Hardy mark.