no no he wouldnt.
he would have knocked them all out in 30 seconds, because he was that much better, however he would never have been tested, it would have been like watching ordinary harrison or khan is there first 5 fights for an entire career.
he probably wouldnt have even been the same fighter, if you can win that easily you wouldnt go on to improve, change styles etc etc, if Ali was around today he would have never hit the heights he did imho, especially in a sport like boxing where you are who you fight.
If he had knocked every fighter out in 30 seconds, how would you decipher whether the other fighters were crap, or Ali was just supremely awesome?