Potentially, you could grow anything, anytime, anywhere. And you would not have to do it in city center, even a bit outside suburbs would lead to substantial gains in term of transportation. Reduction in farming land space could lead to major changes for leaving space.

I think it does not change because land and fuel are still dirt cheap relative to the sale price of vegetables and fruits. Climate change, insect population dropping could lead to more development, but I would be immensely reassured to have it developed way sooner.

Nuclear Fusion. When it was about making a nuke, they gathered fantastic resources and went from Science-Fiction to explosion in 4 years. When it come to saving humanity with nuclear fusion, relative to our current capabilities, there only are relatively small attempts on-going for 40 years. ITER, the most serious attempt, get a budget of $1B a year, a 1000th of US military budget alone.