I think it will be too. He would instantly become "the franchise", if you will, and really give the organization and established talent that could help elevate the promotion to compete with Impact Wrestling, which I think they have a shot of doing if they bring in Punk and, say, Chavo Guerrero.
Supposedly The Kings of Wrestling were offered WWE Contracts.. So they could be leaving ROH sometime soon.
Who knows how long they'll last with the WWE too. There's a big possibility that ROH could really develop into a solid 2nd place promotion behind WWE since it seems that TNA, Impact Wrestling, whatever the hell they are, has dropped the ball big time.