I dunno.
On one hand, it is over the top right now. I believe my current fort has literally (going by weight) mined out more gold then has been mined out in the (RL) history of earth. There is also something absurd like 300,000 magnetite available (going by the prospector tool in df hack). I've strip-mined the first two levels under my fort area and I've got enough metal that it will take a decade to smelt and a century to use. There is no reason to dig any deeper, other then metagaming to find more of a challenge, since the first 20 levels or so (before you even hit the first cavern, even) will provide more resources then you could reasonably use, even if you were wasting it all on stupid things.
On the other hand, last version sucked big time. You had to do lots of tedious exploratory mining just to find a few tiny veins. Metalworking was pointless because you would use up all your metal just training a few guys. You ended up with a metric crapton of useless plain stones which either need to be crafted into stuff to sell or (more likely) hauling off to be smashed by a bridge.
I prefer the current, abundant resources to the old amount but I really think maybe a middle ground could be reached where we have a good amount of resources but we are not drowning in them.
(also trade really, really needs to be fixed so there's something worthwhile to buy with all this metal, but that's a whole different issue)