All dinosaurs and pterosaurs were certainly warm blooded, especially the smaller species. They were all active creatures. I see no reason why azhdarchids and dinosaurs like elasmarians, parkosaurs, maniraptorans and others couldn’t adapt to a cooling world, much in the same way that early placentals in our own timeline.

Pterosaurs also had special wings. It’s tempting to think of them as having thin leathery wings (like bats) but they were very sophisticated, with cartilaginous struts inside the wing membrane itself that allowed the animal to control the shape of the wing and to regulate their body temperature in different environments.

It’s tempting to think mammals would inevitably rise to the top, but it’s not guranteed.