If you heat frozen waffles in the toaster then they can get cold pretty fast. Also some people keep their syrup refrigerated. I've never personally warmed my syrup but it sounds like a good idea. (remember when they came with color changing temperature labels?!)
I don't like the idea of repeatedly microwaving the same syrup container though. It should be poured into a dipping cup first!
Also now I want french toast sticks.