A poll released by ESPN has indicated that MLS has gained significant popularity among fans 12 to 17 years old — so much so that it’s actually about as popular as MLB among said fans. The quality of play has dramatically increased in MLS over the past 18 years, and it’s become capable of attracting big names seeking one final team before their retirements. It’s got to be a worrying trend for MLB — any league that starts losing young fans is looking at smaller crowds and emptier stadiums a few years down the line.
http://espn.go.com/sportsnation/post/_/id/10567570/will-mls-become-one-big-four