Replace or wait? Study says swap all incandescent bulbs now, but hold on to CFLs

Source: Science Daily

LED light bulbs are getting cheaper and more energy efficient every year. So, does it make sense to replace less-efficient bulbs with the latest light-emitting diodes now, or should you wait for future improvements and even lower costs?

https://www.sciencedaily.com/releases/2017/11/171115195255.htm