So, I suspect they have been costing jobs. Society has simply shifted to use a lower percentage of peoples time vs. having large numbers of people never work.
However, unless we start reducing the retirement age down to late 40's or other very large scale changes that's only going to keep working for so long.
But still, we don't see joblessness or masses of people unqualified for the market. Faster developments will lead to many having 3-5 careers over their life time but I don't think that's necessarily a bad thing.
It's true we are creating more jobs, but mostly by having people do things that are low priority and thus low paying. There might be unlimited demand for service jobs like raft guides, but they pay crap because they compete with things like video games.
What disappears is the middle. This means we have to ensure that as many people as possible can get an education preparing them for higher value-added jobs. More diverse university courses and free education could help with that, vocational training can do the same.
Not to say that it doesn't bear risks but there's currently no indication that this time jobs wouldn't be replaced by something better. Just because many think so doesn't make it true, Keynes also firmly believed in the 1930s that we would run out of work and yet I cannot see that anywhere.