I think one of the biggest ways though that the Krakoa era should have impacted the marvel universe is showing the world the incredible power of Mutantdom. They advanced further and faster than any other human race.
What it showed too was how incredibly powerful Mutant Circuitry is. Mutants around other Mutants synchronize and become more powerful together. Mutants around more mutants also create more mutant births and more xgene expression. The more mutants there are together, the more Xgenes are expressed. It was revealed in the krakoa period that had it not been for the genocide of Genosha and the mday hex, mutants would have been on a fast track to be the dominant species on the planet.
That's due to mutant circuitry. More mutants=more mutant births. More in one place means more xgene expression. More Mutants together means increased power amongst mutants.
So more mutants in one place equals a quick growing population with increasing power. Not to mention the synchronizity allows for unique specialization and cooperation, which allows mutant technology to advance at an incredible rate.
Which is why mutants quickly developed krakoa, and quickly cured death, and quickly cured all mental illness and physical illness, and quickly extended human life. Not to mention it was mutant circutry that allowed for the creation of one of the most versatile super metals in marvel.
Mutants in only a couple years of Krakoa expanded to be one of the boradest empires and versatile empires:
Krakoa had claim to:
-Otherworld
-The Shi'ar
-The Brood
-Limbo
And they had colonized Mars, took over the Captain Britain Corps, they even through time travel conquered a planet in the distance past.
The also :
-Solved the food crises by making organic food growth, even had bagels that grew on trees.
-Solved for housing by making organic housing, that was actually developed via studying Tumor growth and applying it to Organic Technology
-They created organic mech suits that would rival ironman like Armour
- They invented Mysterium, the best conducting super metal and a metal to rival adamantium and vibranium.
In the span of what would only be a couple year, Mutantdom created a nation that became an empire, and had scientific advancement that dwarfed that of typical humans, and created a powerhouse of a nation that was able to sustain multiple wars and invasions, even taking on the Eternals and holding their own.
Frankly, Mutandom in a few years of being united made enough progress to catch up to the Inhumans and The Eternals in a way, though the inhumans and eternals had centuries of a head start.
So I think of anything to take away from Krakoa, it should be that mutants are nothing to sneeze at, and United Mutants should be something to be in awe of.
Mutant's united equates to a terrifying and awesome force.