The snark is strong here. 
Anyway, the survivors may find themselves in a very magical, very high fantasy setting... which will just devolve to people seeking power, wars, greed, oppression, etc.
Solas is seeking to change the world, not people. So, the only difference is more mages with access to more power.
A world of super heroes sounds great, and a world filled with people that can do healing magic and magic that can help ease lives and expand one's knowledge and understanding of reality, that all sounds great and a possibility with Solas' plan.
However, he is leaving people as they are, and if the world burns, the horror of it will scar the survivors (Solas included if he lives), that it won't be a world of super heroes, it will be a world of super victims, where some would rise to the challenge of a new world, either selfishly or selflessly, and others would reject the change and be at the mercy of those who rise.