Even if all external countries cut off military aid, Israel still is sitting on nuclear weapons. It's unlikely anyone would try to invade them, they don't want to get nuked.

But in this scenario over the course of 5 to 10 years, they would be less able to power project beyond their borders. That's true.

But let's not forget the The geographic neighbors, the military peers, are incredibly weak. So Israel becoming weak doesn't really make their jobs any easier