I could be wrong, but Germany were one of the teams which helped get the new trend underway. They entered that tourney with a 4-4-2 formation which didn't quite work out for them. They then switched to the 4-2-3-1 in the KO stages and ended up overachieving, reaching 2nd place. You're right, many teams did try out a 4-1-4-1 around that time. I tend to view that formation as a flashy alternative which never quite caught on.