There will always be new platforms like slack, discord, gitter, and whatever. IRC was and still is great.
IRC is simple, its text, its stable. Its simple to program on and a lot can be done above it.
IRC is open.
The basis of old internet protocols are simple, open and powerful
Email, IRC, HTML, FTP
And as the article points out, irc has no face. IRC was a time people had to ask for a picture. Different from the newer trendier platforms. Back then people used to engage a lot more before they became curios to put a face on a nickname.
The internet has been inundated with the "average" people who unfortunately are not interested in "aplications" like mIRC/irssi/bitchX. Looks like average people need apps that are simpler to use than IRC, apps that allow them to promote their profile to the next level, have followers and likes statistic. Which is alright, in the end they are just the average people that wont put effort to learn nonclickable platforms like IRC.
The web really exploded when the smartphone came and apps like facebook came also and made the average people go online and understand what internet was for. There was a time when only the nerds understood what internet really was. Nowadays the internet guy is not a "nerd" anymore. Nerd is not perjorative as it once was.
IRC is still open, IRC is still kicking.
If you are on IRC, dont let the shiny and newer take you out from IRC.
Long live IRC