I don't think anyone has seen enough of Nassib to make a bold statement like "he is our future". But, I do agree with some that are saying if Eli plays like he did last year that we will see an accelerated search for his replacement.
There are those that will say it's the fault of the receivers, O-line etc... but what is missed in that argument is that if the Giants are among the worst in talent on the offense, keeping Eli makes no sense and is unfair to him. It also is of no benefit to the Giants to keep him at that pay scale considering the results last year could be achieved by just about any QB.
Personally, I still hold out hope that he can bounce back. But, if he doesn't I won't be upset if they try some other options.