<p>When I say that the whole human race gets enhanced, I mean one type of enhancement for everyone, not involving Corp. Businesses, govs, I would mean an individual like Tony Stark when he put a version of the Extremis virus in the water infecting everyone (in comics). But he was evil at that time and forced people $100 a day to keep your powers turned on, but minus the money and the turning powers off. </p><p>
</p><p>This would be one way for it to happen, however you lose the free will aspect, though there is no negative or threat to humanity from the enhancement. The main free will acceptance of this situation would be that a significant portion of humans would voluntarily take the enhancement for fear of safety for them and their children from invading alien armies(Chitauri, Kree, Skrulls, Asgardians, Ego, Thanos second army, the many alien groups from shield episodes, Ultron and AI. ) Others would take it to cure lost limbs ( veterans)or injuries for themself or children, mental impairments, psychological issues. A small portion may deny it but they will have to reproduce with others eventually who have the enhancement, which having affected their dna will be passed on to their children. The rest will voluntary take it, or die out due to constant invasion assaults, or be inhuman, evolve into a possible mutant, or upgrade with machinary/cyborgs.</p><p>
</p><p>The serum is in caps blood, they can get it out, Bucky has a version of sss, Red skull blood, the army has a version given to Emil blonsky, Howard made a version (though will severe anger issues but I'm sure Tony could fix that ), Luke cage experiments renewed by doctor on his bro, blood of black panther, if time stone is retrieved then they could bring back destroyed heart shaped herbs, ssserum, and tablet from Odins vault with formula to make you the Pinnacle of your species, they fixed the Extremis boom problem in shield series with blood platelets from a guy with fire powers, the Hyde formula, cybernetics. They have options to have a universal serum. </p><p>
</p><p>Steve Rogers had almost every medical issue fixed major and minor, I highly doubt anyone would be immune but if their is then they would stay human, and be protected or enhance themselves another way, macanical or mystical. The red skull had an incomplete version of the ssserum, which had bad side effects.</p><p>
</p><p>I am only talking about outside threats, every society in MCU and real life always has criminals or those seeking power and to do harm. Even if you made humans weaker you will never solve that problem. I'm saying you need to be strong enough to survive outside Invaders, so that you have people alive to have those internal power struggles that don't go away, or else slavery and extinction.</p><p>
</p><p>Some people may be content with their own lives, but the vast majority of humanity strives for improvement and evolution.</p><p>
</p><p>I agree from a story perspective humans need to be weaker and protected, and this will never happen, or at least not to a lasting result. I meant my original question from a logical basis on the MCU Universe. I do not mean to sound heartless or macabre, but fact is like vaccines in this world, those who don't take them will be weak/susceptible to disease or war, and either change their mind, not make a deal about it because they are saved by those enhanced, or just die leaving only the enhanced.</p><p>
</p><p>Thank you everyone for your intelligent and interesting comments. I enjoy getting to talk about matters like this, not many to do this with in the real world.</p>