It's criminal that series such as these get made and, due to some accountants say-so, get buried in the schedules and gradually slip out of sight. Later on, they're not just extinct but actually buried under the strata of later programs.
'Dinosaurs' was one more of the wonderful things that Jim Henson (And his team) made and which didn't quite fit the corporate world-view. This is one of the many reasons Jim Henson (And his wonderful team) were - and remain - so important a contribution to our culture (Seek out Jim Henson products - 'Fraggle Rock' is just one of many).
Whilst 'Dinosaurs' is plainly a direct ancestor of The Simpsons in terms of family stereotypes, it also shares a trait of biting satire.
The Simpsons has used the family as a dialogue about mindless consumerism (Cf: Homer. Bart. 'Fox') with the inquiring minds (Lisa. Marge. Sax and depth)against the backdrop of the nuclear plant and Mr Burns corporate greed. Over all the weekly drama, we always know Burns controls everything and at any minute that Nuke plant the town economy depends upon could wipe them out in seconds. Before them, 'Dinosaurs' had a similar family dynamic (Though none of the family shares Lisa's campaigning spirit) against the Big Joke that overhangs the series - They're all going to be extinct, but no-one cares.
All the way through 'Dinosaurs', the news, the shows, the products and the adverts give hints that the civilisation of the Dinosaurs is destroying their world. If they don't change their ways soon, they'll all go the way of the Graptolites (Who get an episode to themselves - albeit as mammals rather than hemichordata).
The running joke is always that the Dinosaurs themselves are too smug and selfish to notice they're consumerism and pollution is killing them and their world and the constant warnings never get through.
In a direct parallel to Fred Flintstone's job at the quarry, Earls job is to destroy rain forests. Whilst Fred (In the perspective of the 1950's) had no reason to worry about causing environmental devastation, Earl just isn't bothered.
This is a very knowing series with an agenda.
I rather suspect this is a reason that the corporations decided to just let it slip from the schedules. It's a fine and funny series, yes, but underneath the humour, there's something big and dark and deadly to company PR.
It's not available on DVD in the UK.