Many of the campuses have only partially used space, and many of them are now in dense urban areas, so there is a lot of potential value locked up.
But the motivation seems to be more about getting higher utilization of the the remaining office spaces, as Intel has still not gone RTO like some other tech companies have done.
Also consider that x86 is increasingly losing market share to ARM, and eventually to RISC-V, so the company needs to consolidate and won't need so much lab space as market share shrinks.
Fabs on the other hand can generally be fitted with the next node. They've built too much capacity for the relatively slow external customer growth of IFS. They were way too optimistic about the willingness of potential customers to use IFS when it was in any way connected to the product divisions.
Separating the two and potentially spinning off IFS will solve that issue and if there is enough runway left then IFS will become profitable. But the product divisions are facing a potentially existential crises with ARM and RISC-V.
That is where the big pivot is needed, like what Grove did in the mid 1980s. It's about time to burn the ships and move on to RISC-V..