The Irregular Verb Deadpool
Not that it should come as a surprise to linguists, but a research team at Harvard have demonstrated mathematically that more uncommon irregular verbs regularize more quickly than common ones. They did this by studying works like Beowulf (from the 8th or 10th century, depending on who you ask), The Canterbury Tales (from the 14th century) and even Harry Potter. During this time, the seven conjugation classes used in Old English have become just one in Modern English. Yes, they only studied English, apparently.
As for which irregular English verb is next in line to go regular, their money is on "wed." Wanna bet? We should have the answer in just a couple of centuries.