Additional Thoughts on Technology Obsolescence in Housing

So if you accept my theory that there will come a time when an old house is so much cheaper than a new house as no one will want them due to the associated energy costs, here are a few questions:

•           Can change happen piecemeal?
•          Could I demolish my terraced house and rebuild a nice cosy new one in its place?
•            If I do, would we want it to ‘fit in’ or should we relax planning laws so that we can set it back from the road, build it higher,  add a garage or whatever?
•           If change is piecemeal, how do we evolve from the ‘back to backs’ which worked until everyone decided they needed a car? Or is there a better solution to on-street parking?
•          If change can’t be one by one, how do we avoid the dilapidation and decay stage of the cycle?