[bart]

Serge, you're right in certain aspects.

But we have seen technical evolutions before, each time with people telling us there would be massive unemployment.
Yet, there have never been so much jobs as there are today.

2 centuries ago, more than 50% of the population was working in agriculture.
Then the industrial revolution came, and that made employment shift towards factory jobs.
Automation decimated the number of jobs in production and we saw another shift to jobs in services.

What I do believe, just like you do, is that we'll see 2 levels of employment: the ones where you need very high skills, and then the 'simple' jobs (cleaning, maintenance, distribution).
The jobs in between are rapidly disappearing (cf. banks, stores, ...).
That might bring along (much) lower income taxes, as the middle class has always paid the highest amount of those (higher classes are often smart enough to 'avoid' paying taxes...).