If Larry has 51% of Nodes and wants to change de 21M hardcap he is free to do so, the other 49% of nodes will remain on the original network with the 21M cap, the miners will remain on the original network. He would be completely alone on his own network with a unique blockchain (the correct term is timechain) completely separated from the original one, with no miners or users transacting.

Even if somehow 80% of nodes/miners decide to increase the 21M and hardfork, i would just ignore and remain on the original network with the rest of the 20%. Fuck them.