Maxtro said:
I've wondered what would the world be like if the dinosaurs didn't go extinct. I could imagine a smaller dinosaur that has prehensile hands developing actual intelligence over a vast time period.
The dinosaurs went extinct about 65 million years ago. Humans have only been on Earth for around 200,000 years and look at what we've accomplished in that very short time span. Pretend that dinosaurs didn't go extinct and then one dinosaur species achieved human intelligence 20 million years ago. By now they'd probably be flying in space and mastered faster than light travel.
Assuming FTL travel is possible, yeah. Also, there's no reason to assume that dinosaurs would have evolved intelligence given another 45 million years, they've been around for quite some time in the past without that happening.
However, you bring up an important point. There's no particular reason why intelligence had to have been evolved now (or rather, relatively very recently). If humans ever discover life on other worlds, it'd probably be a billion years "distant" from ourselves (that is, sit around and wait a billion years for intelligent life, or intelligence evolved a billion years ago, not that evolution follows a linear pattern that can be predicted in advance).