Will there ever be a real life modern day super hero?

No, because there's one aspect about superheroes that people tend to overlook. In addition to possessing powers and skills beyond those of mortal men, superheroes are universally super-competent. DC sort of was stressing this in their Infinite Crisis series; when's the last time you heard of Superman punching someone just a little too hard and knocking their head clean off?

In comics, the death of Gwen Stacy was especially shocking because of the reason it happened: Spider-Man screwed up. That just doesn't happen. Real life superheroes can't happen because us human beings are generally too incompetent to be pulling stunts like that. No real person can be that precise with a batarang and not rack up a few accidental deaths.

With that in mind, the usual arguments against vigilantism apply. Operating outside the law, who are you to judge right and wrong? If you're that concerned about crime, set up a neighborhood watch, become a police informant, join the force yourself, or become a political activist. No matter how good he would be at his work, the Batman doesn't follow due process and the lawyers of those criminals WILL get them out of jail for it.

Jam it back in, in the dark.