I've waited 24 years for another game in this franchise. System Shock 2 is one of my favorite games ever. I didn't play the demo of this because I wanted to wait for the full game.
A lot of gamers may be unfamiliar with the franchise, but have probably played games inspired by it. Dead Space was originally developed as System Shock 3, hence the setting and plot similarities. BioShock was developed as a spiritual successor by a few of the people who worked on System Shock 2, hence the "Shock" in the title. More recently, 2017's Prey was an even closer spiritual successor.
Last year, Nightdive's CEO said that they would start development on a System Shock 2 remake after finishing this remake. There's also a System Shock 3 that's been in development by a different studio for 7 years, but I'm not sure if that'll ever get finished.