Ah but benefitial magic comes with its own set of problems. Lillian talked about magic powering technology and while that sounds good on paper, one must also wonder where that would leave people incapable of using magic which is the massive majority of the population; if magic controls the infrastructure, then the most coveted and useful positions in society become available only to mages.
Ultimately, society is highly competitive and magic is a tremendous tool in this regard which means that it would only be a matter of time until power, whether it be political or economical, begins to graduably and inexorably shift to the hands of mages. And once they are an elite not only will non-mages live at their mercy but it will be nearly impossible to dislodge them; it would probably be ever hard than it would be in nowadays world since the infrastructure of Thedas would, by then, rely almost entirely on magic.
Thumbs down for luddism.
Ultimately, we don't even know how such technology would work or what exactly would be needed to power it. A lot of the magical devices that we've seen didn't require magic to interact with (enchanted objects, glowlamps, Circle vaults, Golems, etc.), other than perhaps the Eluvians. Machines created powered by enchantment would be a potential market that anyone could get into, because mages are not needed at any stage of the enchanting process.
I'm probably not thinking outside of the box, but I imagine tasks that require a constant stream of magic thus necessitating the involvement of mages would not be as cost-effective over time. As we know, magic is taxing, and Lyrium that might be used to enhance whatever given process is expensive. I'd also imagine that while many of these jobs could be potentially valuable, they don't really scream glamorous or "elite" (drink-cooler, wheat grinder, elevator operator, air-conditioner and so on).