I wish some retroprogramming fan would do Civilization, The Sims and Minecraft (isometric) on ZX Spectrum. It would be interesting to see how well these would be doable...
(And remember in Minecraft, since the player can do whatever they like, no compression schemes work. Anything that did wouldn't be even a Minecraft knockoff anymore. Minecraft could really only exist on home-machine levels of processing power in the 21st century.)
The other two could be recognizably done, though they'd be relatively cut down.
Could be done
>The Sims There is a home simulator for the C64 I think.