It's interesting that it was only recently "discovered" that the universe is expanding at an accelerating rate, or that it is a shocking idea. It seems like it would be intuitive that the universe has to expand like that, otherwise it would not exist. I really don't think it has a choice. If the acceleration were slowing, it would mean the universe is reaching a certain "point." And any point is arbitrary making existence "unsupportable."
Even expanding at a
specific rate is arbitrary. It has to be an accelerating and un-pinable
rate. Anything that could define the universe as arbitrary would cause
it to cease existing.