That’s my concern. As much as it sounds nice to just let them go and leave us alone, the problem is they wouldn’t. They would, as you said, become the next Venezuela, and would probably end up inviting Communist China or Russia to be their protector. They would end up invading nearby states with the premise of “liberating” them, and within a few years we would have a Vietnam morass right in our own backyard.
If Trump doesn’t take seriously the insane brainwashing of our younger generations by public education and higher “education” all across our land, and the additional insane brainwashing being done by the media, then we are done for. We have traitorous enemies in our land, pushing for our downfall. It doesn’t matter what our economy does in the short term, if we don’t clean the vipers out of the influence makers of our society.
California has a diverse and robust economy. They will be fine as a country. There may some good reasons to oppose this but the economy IS NOT one of them.