So if I'm understanding everyone right...
It's sort of expected that dwarven economies revolve around food, not gold and stone?
Also... While I've got a number of dwarves that can plant.. I've only gone *one* with the labor enabled... One planter, supporting 3/4ths of my fort industry.
It just seems kind of lopsided somehow.
The current implementation of DF makes it very easy to run an export arrangement solely around food. Heck, you don't even need to grow your own food - just buy out the raw materials taht caravans bring, cook them on the spot and sell it back to them for profit. "Why yes, good sirs. You risked your lives to travel across months' worth of hostile and outright evil lands to get your food cooked for you. Have a safe trip home!"
If we're talking mid-term changes, the economy re-write will hopefully mean if you only focus on one industry then you will saturate the market and the price will crash... though whether the fact that food is a perishable will be considered is up in the air. Though hopefully the re-write will also mean you can arrange for really huge caravans to show up at your fort for bigger trade.
If we're talking long-term changes, I expect the 'hill dwarf' settlements will increase the food upkeep of your fortress assuming they don't grow their own food. I assume you'll have to supply food for military expeditions should you send them so that too will increase the demand on food, even more if you don't want to produce the equipment for those expeditions on-site.
Whichever way, I don't think stone goods will ever be that high on the 'pecking order' for lucrative industries. It's a garbage disposal route, not a profit route unless the economy re-write models sudden spikes in demand for random goods ("there is a fashion boom in quartz crafts this year"). If we don't count food, then the lucrative industries are metals, gems (includes glass) and textiles.