The Main Event Mafia was one of the prime factions of TNA Wrestling during their best time period. Booker T was one of the members of the faction along with other wrestling legends like Kurt Angle, Kevin Nash, Scott Steiner, and Sting. Other wrestlers also joined the faction later by expanding it in the process.
The faction looked really good on paper but ultimately it was a failure. Much like the other factions of TNA Wrestling, wrestling fans forgot about this one as well. Booker T who was one of the members of this faction recently looked back at it and explain why it could never be seen in WWE. Speaking on his Hall of Fame podcast, the former five times WCW World Heavyweight Champion said;

Main Event Mafia in WWE? Booker T Explains Why It Wasn’t Meant to Be
“I thought I was the star. You know, I wasn’t the star of the show. I brought something to the table as far as that group. I really wanted something to happen with the Main Event Mafia. The Main Event Mafia was a group that was like none other we were, you know, former world heavyweight champions. We all had a history with each other that, you know, ran back for years. I don’t know why that did not work out. I just don’t know why the Main Event Mafia is right now.
“The t-shirts are still being sold because that was a group, like literally a faction, you know, NWO, DX, it’s something I agree that’s something that, you know, people should still be talking about to this day. I don’t think it would’ve ever been formed in WWE. And that’s why I was so unique, you know and, and how it did come together. All of us were part of that group. We weren’t in WWE at that time, right? We all just happened to be in TNA at that time.

Booker T Was A Member Of Main Event Mafia
“That was a comment, you know; seriously, man, you’re not going to see anything like that ever again. I don’t think, you know, so for me, and then again, you might I don’t wanna say ever again, but for me, that group, we had such a nucleus and the, we had such a nucleus of young talent that we really could have created some great, great stories.
“I could only wish that I had something like that for just one moment in time in the Reality of Wrestling. I only wish, man, that it was gold. It was, it was, it was, it was gold right there in our, in the palm of our hands. And we let it slip by, and I’m not gonna sit here and blame anybody or anything like that, but, you know, none of the stuff that could have happened came to wish what was there.”

The idea behind Main Event Mafia was actually pretty cool but it was not well executed. TNA not only failed to produce many big names, they fail to produce any factions that fans would remember forever. The biggest mistake did was, they always tried to be the replacement of WCW, and they never tried to be TNA Wrestling.
H/T to Wrestling Headlines for the transcription