Danik renoir wrote:point 4 : This does hold some interesting potential : it would allow guilds to focus on whichever aspect of the game they prefer : i.e. a trading guild might go for a wonder called 'Adam Smiths Diary' which would deliver an appreciable boost to trade and profits : A more war-like guild might prefer 'Gunpowder Mill' which delivers a better grade of gunpowder thus boosting fire-power for members ships. Whatever, the path should be long and expensive but giving a notable reward when achieved.
Just to expand on this. Perhaps barring guilds from having more than one wonder could encourage specialization among guilds. A guild that wants to raid would build a wonder boosting their income from raiding but could not build one that boosts trading income.
You could even have a wonder for guilds that that follow a more generalised approach, giving them some benefits but not as strong as the specialised guilds would have.
Effectively this means that guilds would have to choose a specific path and remain committed to it.