Many people lost their livelihoods though in each transition. I find each life valuable but that's just me - yes we are better in aggregate long term but in some ways it is paved with their sacrifice.

If we can find a way to support those displaced even that would be a much better start. e.g. re-education funds, training schools/government run apprenticeships on projects, etc. Especially if the scale of the displacement is large. We all only have the one life IMV - its about giving those lives the opportunities to pivot. Ageism, and gatekeeping will stop many from changing careers.