With the end of Disney Infinity in sight, a fan has created a petition to save it. Here's the link
As of this post, there are 1571 supporters and it is barely two days old. Show your support and sign it! We can't let Disney Infinity go down without a fight!
Also, I am going to be writing a letter to Robert Iger expressing my love for the game and disappointment that the plug was pulled on it. I suggest you do the same. You can find his mailing address among other info via Google.
It's a longshot but like Gazelle (Shakira) sings in Zootopia, try everything even though you could fail.
Update May 14: The teen who started the petition makes the news in Steenburgen
Check it out!