I cannot comment on your accusations, however if Mt.Gox were to disappear overnight it is doubtful the remaining contenders would be able to pickup the slack.
What slack? What are you talking about? Anyone marginally sane can resolve 10 trades a minute, there's no slack there. Look:
http://jezus.si/graf/dashboards/bitcoin/details/lag/See that spike going into the 1 hour range? The fiat exchanges you marvel at the accomplishment and talented individuality of have 30-50
microsecond execution times. There's 1000 microseconds in a millisecond. There's 1000 milliseconds in a second. There's 3600 seconds in an hour. Three and a half
billion times worse than microsecond lag.
So what slack. MtGox is not currently doing something. A dozen people with an excel spreadsheet could deliver their trade throughput. This is not hyperbolae, and it certainly is not on the level of claiming MtGox is "an exchange".