I like the thought of Sam accessing an old archived backup. As a fan of the original
, and one who finds the Nike circuitry lines and bleak-, monotonous-colored world of Tron Legacy a bit visually inferior in comparison, this would help give Disney/Kosinski a valid excuse to bring back more of the old aesthetic from the original ENCOM 511 universe rather than simply re-use the Galapagos Island reimagined/"evolved"/Nike version. So, I'd prefer they access a much older version of the Grid than what you're proposing.
This could help explain why Ram/Dan Shor was teased as a Tron 3 cast member during the Flynn Lives campaign, and would help bring some things I want back, like, yes, the MCP... as an MCP v2.0. Not for fan service, but as a truly well done, believable implementation. Ed Dillinger's son (Cillian Murphy) and his computer alter ego interacting with MCP v2.0, along with maybe his real world father for some moments, could be pretty cool.