There's no clear mid-term research and development plan to follow. We started this game with some vague idea of the ultimate research goals we might wanna achieve - such as a list of GS bulbs, Lib / Radio and t300 win (you were the one proposing this approach), but haven't re-evaluated that since. I'm completely unclear right now on whether we're aiming for 1 AD Education or 500 AD Education or 1000 AD Education, for instance. It's difficult to evaluate current city development without some clarification of these types of goals (infra needed pre-Uni, gpp needed by certain date, etc). As it is now, we could just as well keep whipping another 10 settlers and grab all the good sites we find.
We don't need Educ before we have 6 cities with libraries ready to build unis. We don't need Oxford before Delhi is well developed with a number of cottages. Being well developed also requires enough happy faces (including dyes...

). Our homeland is full of healthies, but not so many happies. The +3

from Rep just cracks the surface of Delhi's needs. Add a forge, ivory, incense and sugar, and we're getting close. Add dyes and a theater and we're getting really happy.
Nothing has changed, in my mind, in terms of those long-term goals, even if they haven't been the center of our discussion.
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As I see it, our mid-term research and development plan is:
1) Develop as many villages in Delhi as possible
2) Develop our six Oxford-uni cities
3) Develop and use Two Fish and Marble as GP farms
4) Develop ancillary cities and build commerce for 100% research. as much as possible
5) Trade techs and maps for as much gold as possible
6) Maybe partially build stone, marble, or copper wonders for the failed gold.
plus
7) Continue exploring to circumnavigate, meet the last AI, find the silk and furs, improve our relations, identify our DoW targets, create false wars for DoW plusmods, etc.
8) Continue expanding as much as our economy will allow, to increase our base research capability and increase our UN votes.