As far as I know, the TV movie was the only project.   I'm not sure why he would do another film about them after creating this one.   It was better than most made-for-TV flicks because of a decent cast and a good script.

I'm not sure why everyone is comparing apples and oranges in this thread.   The Marx Brothers, Laurel & Hardy, and the Stooges all have their audience. Reading some of the remarks makes it seem like we have to choose one over the other.   

The one problem I have with the Marx Brothers is that they made more than their share of bad films. A handful of gems, and a pile of trash. I guess that is the problem with most comedy teams.