It's challenging to make one on your own, but it's doable! Antichamber was developped by only one guy, The Stanley Parable by 1-2 people.
I really loved these two games.
Isn't any game possible for single dev as far as it isn't large scale?
Possible, Yes. But some genres are better suited then others. Some Genres just don't work so well without a lot of resources or high end graphics.
Tactical First person Shooters for example, or mmorpgs.
Classical rpgs are also quite hard for a single person, as you would need a lot of story and dialog. (but its definitely not impossible).
Your end result after spending a lot of time would most likely feel more like demo then a finished and polished game.
Games that have a higher focus on gameplay then story and atmosphere work better, especially if you are able to procedurally generate the content.
but as a person who has made a game generally labelled as this sort (it uses voxel worlds and similar block-types), there is hardly anyone actually interested in playing it, and a lot of random people hating on the project, ...
Can you provide a link? I searched your profile for a while but haven't found your game.
I guess that you have to provide a very finished game in order to make people play it, as otherwise they would simply keep playing minecraft.
It's about time for another Katamari Damacy-like surprise hit to emerge
I never played it. I also never understood it, but i guess its fun if you actually play it.
btw. I guess that creating games for android or iphone devices is another great possibility for single developers.