Bet on it. The presenters at TED Talks will be using the term "delightful" more than "cool." But you didn't read that here first. You read it in THE ATLANTIC. Here is the essay by Megan Garber on how "delight" is crowding out the term "cool."
We Baby Boomers knew that would happen. Soon enough our counterculture term "groovy" petered out when we had to suit up and join the establishment workforce. Laboring in the food coop for peanuts got old. Not to lose our soul to the corporation, we created a mashup of outlaw terms such as "jerk" with MBA language like "stretch assignment."
Well, Millennials are also becoming aware that opportunities require sharing more formal, generational-spanning terms like "delight" to replace the non-stop use of their insider word "cool." Some of them are clients. So, I am bearing witness to that shift. They are getting it that, unless they are Mark Zuckerberg, the serious money is made through networking with Gen Xers, Baby Boomers, and Silent Gens like T. Boone Pickens.
"Delight" is a nice old word. It's safe. And leveraging it in discourse sends the signal that one wants to be inclusive, not exclusive.