I say that because society changes and as I changes our needs change. We used to need gigantic factory mills, now we don't. We used to want intertwined road networks, now we're rethinking that. We may want to build subway lines where we didn't imagine we'd need them,at the same time we want to shutter stations we no longer need. She we start out from living with parents or guardians a studio suffices, then onto bigger dwellings, then we retrench as we become older.

Ps. Not to mention natural disasters and climate change, either modern or historic ala Maya or Saharan changes, for example.

So, yes, design with impermanence in mind.