All of those jobs you mentioned are not economic, they are public works -- and there is no funding for them, so at best those are volunteer efforts, not something to put food on the table.

You're right, in theory we could have a system where we put truck drivers to work doing great stuff. Losing lots of jobs could be amazing if we had the services and programs that made our society compatible with that. But we don't, they will take a long time to establish, and the political climate appears to be reluctant to even start building them. Thus: a disaster.