Dave Meltzer at Yahoo! Sports had a small article in the MMA Experts section going over the potential no-go of the famed "Blood Brothers" fight between Ken and Frank Shamrock. The key quote involves the possibility of the financial backers bailing out of the event after seeing Ken be dismantled by Robert "Buzz" Berry:

But the financial backers for a proposed early 2009 fight have gotten very concerned in recent days after Ken lost on March 8 night to the unheralded Robert "Buzz" Berry in London.
 
Frank noted they would have paid Ken not to fight, but Ken was confident going in that he was at little risk in taking the fight.  In doing so, he has put the value of the much bigger fight at risk.  Frank feels the type of casual sports fan that would be intrigued by the "Blood Brothers" promotion due to the story isn't likely to have seen Ken's most recent fight.
 
Shamrock also talked with Tito Ortiz, whose UFC contract ends after his May 24 fight, about having a rematch in late 2009 as the ten year anniversary of their original match.

The simple fact is that this fight is likely not going to happen. Financial backers, as many hardcore fans know, have been the detrimental part of causing an event not to happen. Once the money is gone, the fight isn't going to happen.

Dave's article points at the obvious problem with the recent events in Ken's career. Ken's glass chin has suddenly become a killing blow to his selling power and potential of providing a decent battle. We saw Phil Baroni's stock drop this last weekend at ICON Sport as well. It isn't unusual for these guys who are hitting the later years in their career to have these problems when the sport that they are participating in is very strenuous to their bodies. For that reason alone, Ken will likely see the same results in more of his fights if he continues his career.

Frank, on the other hand, is a different case. With the age brings more awareness that his MMA skills may be lacking in certain areas, but he counters those problems with training, selectiveness in opponents, and smart gameplans. Fans look down on Frank's selectiveness, but he still manages to make a small fortune with the fights he has taken and still stands to make more in the future. Frank also has one piece of the game that Ken completely neglects, the ground game. It allows Frank to avoid damage and take less of a beating. It likely contributes to the fact that he's more successful these days than Frank as well.

With that said, Ken vs. Frank is not only a lopsided matchup in my mind, but it'll probably result in a disappointing outcome to fans looking for a war between brothers. Casual sports fans may not know what happened to Ken, but as Adam Morgan stated "hardcore fans know better than that". It will hurt the buyrates.

So, open the door for Tito Ortiz vs. Frank Shamrock. Not only are Tito and Frank both smart promoters of their own fights, but they will likely create a war of words in order to really get the fight the hype it deserves. Sorry Ken, you really screwed up this time.