If he is Spider-Man then....
I lobbied for him back when he was rumored for TASM. He'll be the youngest actor to ever portray him on screen.
Good, he'll finally look like a teenager.
Tobey Maguire was a great Peter Parker, but a humorless Spider-Man. Andrew Garfield is a better wisecracking Spider-Man, but an unlikable, hipster-ish/skater/cool Peter Parker.
I think Logan Lerman is the perfect balance of both worlds, a likable, nerdy Peter Parker, but wisecracking and full of humor as Spider-Man. He would be perfect.
I love Spidey, but I think in general he needs a massive makeover. The problem I believe whether you like the Garfield/Webb reboot or not, is that they rebooted too fast, after just one messy film. Also I think that when a film is made a studio and the creative team should work together, but in this case, Amy Pascal, Avi Arad, and Sony had wayyyy too much input and control.
Integrating Spider-Man will bring a breath of fresh air to many, and I think his box office numbers will do much better. You can call the $700 million that TASM 2 made a success, but the hard truth is, it wasn't enough, we live in a world that $700 million world wide and $200 million in the US box office is a disappointment. Also the negative feedback didn't help as well.
With Marvel contracts, especially the big three, Downey, Evans, and Hemsworth coming to a close, it makes sense that Spider-Man will be the face of Marvel Studios in Phase 4 and so on, should Downey, Evans, and Hemsworth not return for more.