I see the primary benefit of WiFi to connect to a leader board, or an ongoing virtual tournament. It's been debated fairly extensively that there's no foolproof way to compare scores on different machines on different days, or even different times of day, so adding the technology to do so would be the key. For example you register with the machine, and it automatically adjusts to tournament settings including specific outline gaps, slope, verify that the glass is on, etc
Even for the home, the ability to have a game automatically adjust settings for casual vs pro players would be a benefit, as everyone acknowledges it's far too much effort to change leveling, slope, outlane gaps, and software settings between games to make it fun for everyone. In fact the ability to switch these between balls is a great way to promote competitive handicaps in a multi-player match.