>>15
Black holes can increase in size, along with its accretion disks. As stuff falls in, its mass increases, which causes the event horizon to grow outwards.
The boundaries of a black hole's gravitational field is infinite. I think you're saying that the deviations from Newtonian theory is very small far away, which is true. It is also true that black holes are not magical vacuum cleaners that suck everything up. The OP was assuming that somehow, everything already got sucked in.
evaporate -> hawking radiation; that takes billions of years