You don't have to tell Nokia that the original N-Gage was not the success they had imagined. They already know. That won't stop them from giving it the ol' college try as Nokia plans on rolling out a new N-Gage by this September.
In a brief statement on the official N-Gage blog, Nokia makes mention of a September release amidst reassuring that more than two publishers are on board for the new platform.
At the moment, only EA Mobile and Gameloft have known commitments for the new N-Gage with both publishers having already released titles for the original device. With Gameloft holding the lucrative Totally Spies license, we can only cross our fingers and hope for a next generation N-Gage follow-up.