The idea behind Crystalwell is to start putting a DRAM pool on an interposer. The physical benefits to it are potentially very large.
In the future, that could obviate the bandwidth advantage of a discrete card, if the interposer solution can scale capacity up to something useful.
The thermal requirements would have to go down, although some high-end CPU TDPs may be climbing into discrete card territory in the near future.
However, the tone and insunuation in that snippet indicate something different going on besides simply making the physical separation unnecessary.
Potentially, something like refusing to scale up the PCIe bandwidth of the desktop and mobile chips, or quietly exerting pressure to prevent attempts to extend PCIe so that it can support coherency would do the trick over time.
edit:
Another possibility I don't know if Intel has the pull to do would be to put as much pressure as possible into form factors with restricted or very limited expansion capability. If the hardware in the expansion slots is too competitive, too bad for them needing expansion slots.
Every corporation works this way.
