I agree, the Dino-robot Concept hasn't died or gone away but the original 'Dinobot Team' of 5x Dino-robots comprising:
- 1x Tyrannosaurus Rex - Grimlock
- 1x Apatosaurus/Brontosaurus - Sludge
- 1x Triceratops - Slag/Slug
- 1x Stegosaurus - Snarl
- 1x Pteranodon - Swoop
...& Named 'The Dinobots' hasn't been truthfully or faithfully revisited in it's entirety since the original 1980s iteration that defined and popularised the concept; that is, I believe, what people refer to as the 'Dinobots being extinct' as the concept really hasn't been the success it once was because that core team of 5x figures/characters has never been produced since and hence why Hasbro was looking to drop it moving forward with it's new 'Aligned' Continuity.
(Of which High Moon Studios & Matt Tieger have done brilliantly to 'Revisit' or 'Reinvision')