But what would reverse the direction of social progress toward equality?
A devastating catastrophe that wipes out a large percentage of the species? Protecting women--and their ability to reproduce--from harm could become a very high priority.
I don't know if
Star Trek's World War III killed enough humans to do the trick, but mentions of previously unheard-of past disasters tend to pop up in Trek fairly frequently.
The WW3 in Trek probably served as means for social evolution - a wake-up call if you will, for unification which was further solidified by arrival of Vulcans.
How humans are portrayed early on in TNG is realistic for us as well to achieve (it's no utopia though - utopia implies 'perfection' - that something doesn't change and stagnate - and that's a fundamentally ludicrous assumption because things change on a regular basis, including a system where money, war, poverty diseases, etc. have been eliminated - its not perfect, but its a heck of a lot better than what we have now).
Trek on the other hand retained many things from the outdated system (such as government and people in power - why? - because it probably would have been too 'alien' for people to 'relate' to - talk about treating people like morons).
The problem lies in not our technology/resources to pull it off (we had the means for decades actually), but the monetary system under which society operates, which is severely limited and doesn't allow people to see it - many also cannot accept the possibility of an alternative where money doesn't exist because they have no ability to 'think outside the box' (in effect, the monetary system and the notion of assigning 'value' to everything became all there is to them - the concept of sharing and managing resources intelligently is frowned upon because the society is BUILT on the premise to stimulate greed like behavior and competition via artificial creation of 'scarcity' - hence, nothing else is possible - add in some cultural myths passed down from generation to generation about what they think 'human nature' is [they think its greed] along with what exactly motivates people [they think its money], and you have a recipe for current version humanity - to note, applying scientific method to examining what 'human nature' is and what generates incentive is in contradiction to the myths people spout on a regular basis - which they do to preserve the current system).
"Unleashing" humanity with its present mentality on the galaxy at large (and dare I say it 'universe') would be ludicrous honestly and probably a recipe for disaster.
There are so many options on how to do solve problems today (even decades ago) on the planet, and its simply not done due to the pursuit of 'profit' and 'money' (not to mention the illusion of 'power') that the system we live in generates.
Oh well... the collapse of the monetary system is imminent and it will be interesting to see what will happen when majority of the population on the planet loses jobs due to automation in practically every segment - think what you will, but Humans simply can't keep up.
Production is already way up, but purchasing power is low (or decreasing).
Same thing happened during the great depression in 1930's.
Scarcity was not a problem - there was more than enough to go on for everyone (in food and material wants/needs), but people had no money to buy anything.
People are merely clinging to the old system because its the only one they have known.
Not to mention that today, there are ridiculous fictitious fears of 'machines taking over' that stem from Hollywood's idiotic movies (which people actually use as 'evidence' even though they have no basis in reality- its the Human factor you should be concerned about and the manner we use technology today - and we don't use it for 'betterment of mankind').