I agree. I highly doubt that there will be a 6th gen. The 5th gen will continue to be sold however.
As for the idea of "keeping the iPod Touch around as an entry into the Apple ecosystem for kids" if that was ever true, that time has passed... during the downward slide in iPod Touch sales over the past 4 years Apple has done nothing to revitalize sales.
I don't think they will sell a device that isn't capable of running their latest OS. I feel that when the A8 comes out it may get the A6 without any mention.