Speaking of R-C-I triangle, did I mention you can build a city just with utilities, parks and housing? no C and I needed at all.
And that is really hilarious ;P There isn't a R:C:I dependency in this Sim City game at all. At this point I must wonder if they dumbed it down intentionally... "oh looksy, it's so shiny and accessible!" I hear the reviewers say..
You know, someone did this in SimCity 4 as well.
They just had utilities and tons and tons of toll booths. So there was some brokeness there too.
However, for that version, it wouldn't scale. As the number of jobs a toll booth offers is very limited, and so is the number of roads you can have that will still give you income if you toll booth it, you could only have so much population before you either run out of room to place more toll booths or you start having high unemployment. Basically, you would have to avoid heavy or possibly even medium density residential, thus capping your population to a pretty low value.
Because of these limitations of this sort of ridiculous setup, the brokeness was very minor, and thus the RCI triangle still stood firm.
In SimCity 5, you can actually get this sort of thing (replacing toll booths with parks, I guess) to scale upward to a well populated city...
Yea, that is a sign of something going wrong with the RCI balance.