I'm going to make a prediction here: Including memory on a multi-chip module/building systems around an MCM SoC is going to become the standard for a large fraction of the personal computer market.

The performance gain from doing so in CPU<->core memory and core memory<->GPU transfers is huge, and the manufacturer can match RAM timing and performance precisely to their processor or even implement non standard ram types as they like. There are other benefits too like simplified motherboard design.

Now that Apple has taken the risk, other manufacturers will look at doing the same. Not all computers will use the SoC model, but for laptops and many desktops this will be a big win.