The wizarding world would be quite shocked at first. Harry is a hero, and Snape has a rather controversial past. But as time goes by, they would see that their relationship is based on love. Some would still be skeptical, but many would come to accept it, especially when they see how well they raise their kids.
Most would be in shock. The students at Hogwarts who looked up to Harry would be deeply disappointed and confused. The teachers would be horrified and would immediately start an investigation. Some might even turn against Harry, believing he had finally gone too far.
The wizarding world would be in shock. Harry is seen as their last hope, so his surrender would make many lose faith. The Order of the Phoenix might go into a state of chaos, trying to figure out how to rescue Harry and continue the fight against Voldemort without him.
Some students at Hogwarts might be disappointed. They could have been secretly enjoying his fanfiction works and were looking forward to new stories.
Some in the wizarding world might be shocked and disapproving, especially the more traditional families. They could see it as irresponsible given their young age and their roles in the fight against dark forces. However, their close friends like the Weasleys might be more supportive and offer practical help.
The wizarding world would be in shock. Harry was seen as the 'Chosen One' to defeat Voldemort. If he joined the Death Eaters, the Order of the Phoenix would feel betrayed. They might try to rescue him or think he's been an undercover agent all along. Hogwarts would be in chaos, and students would be confused and scared.
The wizarding world would be in chaos. They would realize too late that they had pinned all their hopes on Harry and neglected him. There would be a great sense of guilt and despair. The Hogwarts students would be shocked and many would feel a deep sense of loss. The teachers might question their own actions and inactions that led to this. The Order of the Phoenix would be in disarray, having lost their main weapon against Voldemort.
There would likely be a great deal of anger and a thirst for revenge. Harry has many friends and supporters. They would probably form some sort of resistance against Voldemort, but they would also be mourning Harry's death deeply. Some might even question if there was more they could have done to prevent it. The Ministry of Magic would also be in a state of turmoil, as they had been relying on Harry to end the threat of Voldemort.
The wizarding community at large would be divided. Those who have always been skeptical of Harry, like some of the pure - blood supremacists, would use this as an excuse to smear his name further. However, Harry's true friends would be desperate to prove his innocence or, if he is actually guilty, to help him come to his senses. Ginny's friends, like Luna, would be worried sick and would do whatever they could to get her back safely.
Some might be angry, thinking he's abandoning his responsibilities. The Ministry of Magic might try to persuade him to come back or even use force if they thought it was necessary for the safety of the wizarding world. His friends, on the other hand, would likely be sad and try to understand his reasons. They might also try to convince him to return, as they know how much he means to the fight against evil in the wizarding world.
Well, there would be a huge uproar. Pure - blood supremacists would likely use this as an example of how the wizarding world was going to the dogs. The Hogwarts faculty would be divided. Those who knew Snape well might suspect there was more to the story, but those who only knew his past would condemn him. Hermione herself would face a great deal of ostracism. She might have to leave her job at the Ministry if the public outcry was too much. And her relationship with her friends could be severely strained as they struggle to come to terms with this unexpected and controversial situation.