I welcome it in a very pragmatic sense for drastically reducing bureaucracy of our social system (only in theory though... we're in Germany after all ). I furthermore welcome the idea of eliminating existential fears, which I'm confident will create a better and more human standard of living with more care and happiness, and I do believe (unlike most libertarians) that a society with insufficient equality can not realize its full potential.
My main issue with it then is that most models require the "big state" solution which may become corrupt over time (see GEMA - what a great idea in its beginning, democratic and all, but look what it has become ). Unconditional my ass, more and more conditions *will* sneak in through the back door, just watch.
So I'm looking for other ways to achieve something similar to a basic income guarantee. The best would be when people can issue their money themselves (think Ripple etc). Some friends and me, we're working on the concept of some kind of network economy.
About automation and technological unemployment, most libertarians will argue that your point here is a Luddite fallacy, and I agree to a degree. New technology opens more possibilities, creates more desires and demand for those possibilities, and thus creates new jobs. For example, we software developers are in huge demand right now in order to achieve this automated society, and we will be the working class of the 21st century. They're already trying to streamline our productivity into industrialization-like schemes with all those agile/scrum/kanban (Toyota!) methodologies. The problem with technology is rather always structural. People lose old obsolete jobs and cannot learn new things fast enough, hence these phases of recession. In 200 years, everyone will want their own spaceship, then soon after everybody will actually *need* their own spaceship in order to be able to get a job at all somewhere in our solar system. And you'll be there then demanding an unconditional spaceship for everyone. In 500 years, maybe there'll be interstellar travel, and the new working class will be, I don't know, maybe space-time curvature architects.
The jobs created by new technology will never be enough to sustain the masses. Plus, only a handful or people will be skilled/intelligent enough to work on this new technology. A universal basic income is needed.