Not could - would.
The dark ages lasted for about 700 years (roughly the 6th to 13th centuries) where there was no scientific research and everyone believed in a god.
We would be colonizing the nearest stars by now if the dark ages hadn't existed.
That could be a possibility. Imagine how technology evolved rapidly since the invention of steam engines in the 1600s? In just a span of 400 + years, here we are now, having the modern tech laid before us. Only if those people back then didn't delay scientific advancements, imagine what kind of technology would we have right now? We could have set up colonies in different star systems by now if not because of those close-minded religious dudes believing that science is the work of demons and is only a way to distance Man from God.
I am not certain this is true. The dark ages may have been a necessary prelude to the explosion of science, knowledge and philosophy we call the Renaissance. Something like night and day, winter and summer. Maybe.
And it's certainly not accurate to suggest that pre-microscope, pre-telescope, people were close minded. They just couldn't SEE THINGS. Were you or I there now, we would be certain of "Rational and Logical Thinking" which led to conclusions that are now thought of as ridiculous.
Back to the subject, note the phrase "Colonizing Mars" is a hugely different thing than saying "Making one trip to Mars." There's nothing wrong with considering 250 years as a reasonable timeframe for "Colonizing Mars." And with the highly productive robotic rovers, we are doing a great job towards advancing such goals. But much very basic stuff remains to be understood.
Further and prime most, I suggest that when this exploration and colonization happens, they will be using Bitcoin.
Not only will they be using Bitcoin (or what bitcoin develops into with the advent to household, quantum computers), but government as we know it will be a thing of the past. There won't be any IRS. There won't be any police-brutality-plague. People will rule themselves under common law, based on if they harm or injure anybody.
Probably, there won't be any petrodollar, business people who rule the world. Things will be free and just. Mars missions will be based on individuals doing thier thing in the Mars program, based on volunteer giving to a company that doesn't have any government red tape, and that operates freely for those who donate. In fact, it will be the people who donate that will be making the decisions... based on real value donations, rather than on some fake fiat donations of a debt system that is bank controlled.
Courts will only be there to help sort out issues between people. Corporate veils will be bypassed in man to man court issues... even corporate veils regarding the defrauding scheme of the current Mars program being talked about in this thread.
There will be real value for value in the Mars program.
Why should I believe in YOURS?
This is all backwards. You should believe in MINE. MINE is BESTEST.
https://www.youtube.com/watch?v=KSGuBNopzBw
And you can TRUST ME. Course right now, things be looking pretty bad and getting badder.
https://www.youtube.com/watch?v=meCZ5hWNRFU
And we ain't gonna colonize that Mars until we knows how to make fiddles thar, out of that dirt or something.