I predict that cheap parallel processors/clusters will be common in the future and I would be able to build an array of such processors for my home network (Network Attached Cluster perhaps). Adaptava is shipping the Parallella supercomputer platform now (Kickstarter project). It has 16 processor and can do 100 GFLOPs at 2W all for around $100. Future versions are expected to offer 64 to 16k cores and reach 20 TFLOPs. It would be fun to pair such devices with Mathematica. Maybe you could do some real time imagine processing of video from a quadcopter this way to control the copter, for example. It would be neat.