What's the noun for dinomania? Here's the word you're looking for.
dinosaur
Any of the animals belonging to the clade Dinosauria, especially those that existed during the Triassic, Jurassic and Cretaceous periods and are now extinct. [from c. 1840]
(proscribed) Any extinct reptile, not necessarily belonging to Dinosauria, that existed between about 230 million and 65 million years ago.
(figuratively, colloquial) A person or organisation that is very old, has very old-fashioned views, or is not willing to change and adapt.
(figuratively, colloquial) Anything no longer in common use or practice.
“You almost never find a complete fossil of a dinosaur. In order to know what a dinosaur looked like, scientists often have to find several sets of fossils.”
“Instead, he was increasingly seen as a dinosaur of the industry, a filmmaker desperately trying to stay afloat.”
“The guy is a dinosaur. He doesn't know Facebook from Myspace.”
“For what self-respecting dinophile would want to think of his favorite stock—the carnivorous lineage known as theropods—in undignified fashion, all covered with feathers?”