Continually adding numbers past thirty would be rather difficult. xXxI onward doesn't look very appealing and there have been very few Wrestlemania where the actual number is presented on the logo.
I think they want to express that , nowadays we are living in an advanced world, we can do all our work in the internet easily, the button may represent new technology...... or maybe the button means we can watch all wwe matches in wwe network.
because of the network i'd guess
good
....
