Look-although The Amazing Spider-Man 2 didn't do fantastic in the box office, there WERE plenty of people who actually did quite enjoy it, like myself.
Those people will watch and hopefully love The Amazing Spider-Man 3. Those who don't care for it, so what? They don't have to watch- no one's making them. I will be among those who will watch it. Because a wonderful story and exciting storyline (in my opinion) such as this can't simply be discontinued.
For the loyal remaining fans out there, leaving them hanging on what might be acclaimed to be the second and last installment, it wouldn't be the right thing to do.
And Andrew Garfield has done amazing so far, why stop with him now? Hopefully he will reprise his role. He just seems like the right man for the job. Cause I don't know about you, but I hate it when beloved characters in a series are suddenly replaced by someone who either doesn't do the part justice, or gives it a weird feel by replacing the former actor. So please, do make the third Amazing Spider Man. And have Andrew Garfield come back. Thanks!