Level-5 CEO Akihiro Hino posted a question at Twitter today.
イナズマイレブンMMOーRPGってあったら、みんなやりますか？— 日野晃博 (@AkihiroHino) May 7, 2012
"If there was an Inazuma Eleven MMORPG, would you play it?"
The next known Inazuma Eleven game is Inazuma Eleven Go Shine/Dark on 3DS. While this game has time travel elements, it appears to follow the franchise's standard gameplay formula.