But PLATO did pretty much re-invent terminals in the 70's, with a touchscreen (infrared), flat-screen plasma display which later earned Don Bitzer and his two co-inventors an Emmy, was mentioned in an IETF IRC, and was also credited - together with PLATO itself - as inspiring some of Xerox Parc's work by Alan Kay, despite the big differences in technology used by the PLATO and Parc groups.

Then there's PLATO Notes, which inspired Ray Ozzie (who worked on PLATO at UIUC) to create Lotus Notes, which pretty much ruled the eMail/workflow world back in the day (Ozzie went on to introduce Azure while Microsoft's CTO/CSA). And while certainly far more primitive, the paradigm of students using PLATO V smart terminals to connect to CDC mainframes that served up courseware in the 1970's bears more than a passing resemblance to how kids in 2023 connect their laptops to Google's Cloud to serve up Khan Academy lessons.

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ECE alumni win Emmy for inventing the flat-panel plasma display 10/23/2002
https://ece.illinois.edu/newsroom/news/2541
In early October, three University of Illinois Electrical & Computer Engineering (ECE) alumni received an Emmy Award from the National Academy of Television Arts and Sciences. Donald Bitzer (BS ’55, MS ’56, PhD ’60), H. Gene Slottow (PhD ’64), and Robert Willson (PhD ’66) received the prestigious award for inventing the flat-panel plasma display, the forerunner of today’s high-definition flat-panel television monitors.

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Internet Engineering Task Force RFC 600 - IETF November 1973
https://www.ietf.org/rfc/rfc600.html
INTERFACING AN ILLINOIS PLASMA TERMINAL TO THE ARPANET
The PLATO IV System based at the University of Illinois at Urbana is a highly sophisticated and very powerful approach to Computer Aided Instruction. The PLATO IV system makes use of a plasma display terminal that is a unique device with capabilities not presently found on computer terminals. A number of ARPA supported projects intend to use the plasma terminal on local connection to computer resources or by long-distance connection to the PLATO IV System.

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Quora: Was the Plato IV system any influence on the Alto and PARC in general?
Alan Kay I am the Alan Kay in question.
Upvoted by Michael David Cobb Bowen, former P/A at Xerox (1982-1989) and Mark Decker, former DocuTech Analyst at Xerox (1979-1997)
https://www.quora.com/Was-the-Plato-IV-system-any-influence-...
We liked the Plato people a lot. Like the ARPA community and Xerox Parc they just invented and built everything they wanted that they couldn’t buy.

But they and Parc were on completely divergent paths. Plato ran on a 1000 terminal time-sharing system, and the displays were slow. So what they went after was very different (some of it was quite good, and some of it inspired us to do better with the vastly more powerful/person Alto).

Back to 1968. We were aware that flat screen displays were coming, but it was very exciting and inspiring to actually see a working one. This led to discussions about when the transistors in the Flex Machine could be put on the back of a flat screen display to make a tablet personal computer (the answer was in about 10 years we thought).

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Lotus Notes (aka HCL Domino)
https://en.wikipedia.org/wiki/HCL_Domino
"Notes has a history spanning more than 30 years. Its chief inspiration was PLATO Notes, created by David R. Woolley at the University of Illinois in 1973. In today's terminology, PLATO Notes supported user-created discussion groups, and it was part of the foundation for an online community which thrived for more than 20 years on the PLATO system. Ray Ozzie worked with PLATO while attending the University of Illinois in the 1970s. [...] the installed base of Lotus Notes has increased from an estimated 42 million seats in September 1998 to approximately 140 million cumulative licenses sold through 2008.