In TWC, the Dutch economy is absolutely incomparable to other civs' due to the existance of the Saloon and pure gold costing units.
Dutch in TWC have the ability to expand their economy extremely quickly, but at fairly great cost. However, they gain the benefit of a large part of this economy being unraidable, inexhaustible and when combined with pure gold costing units, extremely efficient.
Let's say you do a standard build order and end up with about 20 villagers and 4 Banks by 8:30. Or a rough equivalent of 38 non-Dutch villagers. You did this at a cost of 1300 gold, 1400 food and 1400 wood. While that's a pretty huge investment, thanks to the Saloon, it's more than worth it.
Before TWC, the Dutch had fairly decent Mercs (but lacked the shipments for them) and a fairly standard military. They couldn't take real advantage of their economic superiority at this particular stage of the game. Now though, unless they get really unlucky and get something like Ninjas + Manchu at the Saloon, they can break out in a show of power that rivals even the good old German Merc FF from way back when.
Depending on the quality of Mercs available at the Saloon, Dutch strength at this stage of the game can go from very good to nearly broken (i.e. Elmeti + Highlanders combination).
And that's before we get into the Halberds issue. Which gave Dutch the ability to have a very strong standard military, to pour their economy into.
So don't worry about the Dutch economy in the long term. You have excellent odds at finishing games before that ever becomes an issue. Indeed, I would say that the Dutch economy/military combination in TWC is so good, that Dutch are the 3rd strongest civ in the game right now.
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