When this is over I think at least some things will change. I expect some businesses will go under but I also think, and in fact hope that we will do some things differently.
For example the development of systems that many businesses have invested in for their staff to work remotely will hopefully prove themselves and encourage employers to continue that to at least some degree - that would have great benefits all round - businesses with remote staff could reduce their city footprint and thus expenses, employees will commute less - offering less fatigue and more flexibility, road and transit infrastructures will have less pressure on them and that could reduce pollution. We are already seeing a major drop in pollution levels in most cities, maybe that will encourage governments to move on their environmental commitments with this breathing space we are having.
The double-whammy of over-production of oil and a reduction in consumption is putting pressure on the oil and coal industries and again governments depending on them too much for revenue (hello Canada!) will encourage diversification of their economies and work forces to sustainable industries, especially in the energy field.
Now we have been handed a lesson: without doubt the immediate improvement in our environment as we reduce economic activity should put paid to the arguments that we are not a major factor in our environmental problems. It's up to governments, industries and society to do something about it while the lessons are still fresh.