However, even the best thermal cameras are fairly low-resolution -- getting beyond 640x480 generally costs more then a car. So you want to overlay the images, and view them side-by-side, and see if one can tell you something about the other. That workflow could use a lot of improvement.

Also, thermal images have some weird artifacts. In visible light, since we've all grown up perceiving it, shadows and reflections are just natural and we don't even notice them anymore. But medium-wave infrared tends to reflect off things we don't think of as reflective, and it confuses a lot of first-time observers. Different surfaces have different emissivity, and tend to take on the apparent temperature of the background or reflected scene, which is often the sky itself, and the temperature of the sky is a whole 'nother topic. These artifacts are so confusing to untrained observers that they've spawned an entire genre of TV shows ("ghost hunters"), and continually trip up new analysts.

All that being said, yes, adding thermal cameras can definitely produce more useful data. It just might not be suitable for crowdsourcing.