I wouldn't be surprised if it's coming. As I now understand daylight savings time, most countries have kept it for a similar reason: it's cheaper to operate businesses when most work happens in daylight. How expensive it is for us workers to light and heat our homes in the twilight and darkness, not to mention the negative health effects of not getting enough sunlight and the twice yearly induced jetlag, is an "externality" which isn't considered relevant.
You're probably quite right, at some point the cost balance will tip towards night being the cheaper time to operate a business.