Some get on, keep walking and make great progress. Others get on and, mistaking their relative progress, stop walking thus holding up everyone behind. Still others keep well away from the "new fangled devices" and walk alongside, but are constantly flustered and exhausted from trying to keep up. A few arrive early, and wait nearby rather than getting on - but then suddenly realise that the moment has passed and miss their flights. Some get on, relax, don't look where they are going and hurtle off in diametrically the wrong direction.
And of course the airports are designed in an entirely new way because the tech solution allows new layouts and approaches. Oh yes, and finally nations are actively competing to produce the best airports partly to attract the new users, but partly because of prestige.
See also the slides I used at ASPA in Perth to illustrate the point