Only if you approach 0 from the positive side. The limit of 1/n for n -> 0+ is infinity; the limit of 1/n for n -> 0- is minus infinity.
Which is why you can't in general assign a value of infinity to 1/0.
The point is that if you measure whether or not the photon went through slit 1, you "force it to take a stand", and choose which slit to go through. Thus, the wave function collapses and you no longer get the interference pattern, but just two blops of photons on the back wall.
I don't think you know what "exceeding the goal" means. This wasn't expected to be a perfect, smooth flight with a soft landing - it was the very first flight of an incomplete version of an all new design, and the succes criterium was simply "getting liftoff". And by that standard, it was a huge success!