Ask your son to take classes that help him progress toward graduation. Beyond that let him make his own choices—don't pick a class for him just to pick a class

Housing can change if something becomes an everyday necessity or old necessities become useless. I'll bet people in 1982 would be shocked to learn every house has internet access that bypasses the phone lines and that landlines are a dying concept.

For the US, I think climate change will fuel adaptations. Expect sturdier structures near coasts. Energy efficiency will matter more as heating/cooling bills increase and as building supplies increase in cost. Better use of natural lighting might also be in play. Vertical gardening as both an aesthetic choice and a way to supplement household pantries. More rain barrels might increase demand for non-toxic roofing shingles (currently they make most rainwater unusable even for vegetable gardening).

Fewer homeowners associations (hopefully).

Long shot: Roomba niches. Little spaces in the wall where Roombas can go to sleep before their next adventure. Even better if it lets them pass from room to room.