I have mixed feelings about the TSPL. I agree that they do need more rides for kids, and adding ride capacity to a park like DHS is rarely a bad thing. On the other hand, I feel like it's lazy thinking to put in off-the-shelf rides. Regardless, at least there would be some movement.
To be fair, the alleged menu of rides for a DHS TSPL is:
1. Clone of RC Racer
2. Woody's Roundup, a re-themed version of Mater's from DCA
3. A Buzz themed version of the new Luigi's LPS ride coming to DCA
RC Racer is not really a kid's ride at all. It's got a ~47" height restriction so it's geared towards tweens/teens and adults. It's a mild thrill ride, not one for children.
Mater's Junkyard Jamboree has a very low height restriction of 32". That's basically a "no hand held infants" level, so it's more or less all ages. I'd consider it more of a family ride than one directed to kids and can certainly be enjoyed by adults without children.
We don't know the exact details of the new Luigi's ride but it seems sort of like Aquatopia from TDS. Again, all ages, something that would be reasonable for adults to do.
None of these are anything like Slinky Dog Spin (or Bug's Land rides) that are aimed squarely for children. Certainly, these flat rides would skew younger in their appeal, but they would IMHO help to round out the park's offerings.