I theorize that by 2010, Evangelion fans vs Gurren-Lagann fans will be the most famous argument in anime history.
Eva fans will call all GL fans new to anime and tell them to watch 'classics'. GL fans will say that Eva fans have nostalgia glasses stuck to their faces.
By early 2011, the "I think both are great" front will show up, and will be hated by both sides, until later 2011, when a large number of both forces decides to join them.
Over roughly the decade after, the Eva and GL sides will rise, fall and rise again repeatedly, until finally, sometime after 2018, the "I think both are great" will contain all previous Eva and GL fans, bar the ones who hate both shows due to the fanbases.