I predict by 2019 we have even more computing power in our homes than before. Windows is still the leading one. We all own our hardware because it's so cheap. Processing power is way beoynd what we need if we don't do games etc.
Operatingsystems runs as virtual machines and when infected by a virus or trojan a last-known-good image of your OS starts in the background and transfers your desktop and data into the new one and puts the infected image in the thrashcan, everything done without any reboot and without you noticing much.
Oh and Amiga like OS'es do well in the open source world, and
closed source ones are struggling quite like today with a very
small userbase and old technology.