[tbrownaw]

Well only one pool of data, no more registers, cache, hard drives etc. The storage will live next to the logic.

Even if all storage uses the same underlying persistence technology, access times will still depend on the distance between the data and the logic. If there are ALUs intertwingled with the storage, access times will still depend on how close the various pieces of data being worked on together are.

Parallel algorithms tend to lose performance as they get chattier and as node speed is lost to increase node count.

Storage living next to logic is effectively a miniaturized version of the "datacenter as a computer" or "warehouse-scale computer" setup that some places are using already. I seem to recall seeing whole books written on the additional complexities of writing software to take advantage of such an environment.

There will never be "only one pool of data". At a minimum, there will be "data in the physical thing that stays on the desk", "data in the physical thing that goes in my pocket", "data on such-and-such private network", and "data available over the Internet".