A few intuitive thoughts on building heights, from a non-architectural perspective.
In the past, tall buildings were situated in downtowns for a variety of reasons, but mainly due to economic efficiency factors such as density, land scarcity, and square footage costs. Also, the hierarchical characteristic of corporations has been, until recently, a driver of height rather than horizontal (the CEO gets the penthouse view!).
These factors still work to influence the building of skyscrapers in downtowns, but less so today. With corporations downsizing and being more horizontal in organizational structure, there's less a need for very tall buildings for office space. And financial penny-pinching may influence developers to go easy on construction costs (maybe even if economies of scale mean it's cheaper to build up rather out on the small lots downtown).
A major factor that seems to work both ways (i.e. high profile vs. low profile) is the relatively recent introduction of residential condominium towers downtown. Some residents prefer to live "high up" for a nice view of the landscape. Ergo, tall towers. However, if there are too many tall towers densely located, then some eyeball views of the landscape are going to be blocked. In the past, irate residents have even sued on dubious claims that they're rights to a clear view of the landscape have been violated by an adjacent skyscraper that blocks that view! Not so much around these parts. But, as you might imagine, the southern Florida area had some lawsuits awhile back because of those tall condos blocking residents' views of the beach.
In regards to the foregoing, I'm aware of the height-restriction controversy that erupted recently in our own cultural district. The idea being that tall buildings in that environs would block one's view of the museums, or something like that.
One other deterrence to greater building heights is related somewhat to historical preservation. Historically, of course, buildings were not as tall as they are today. So a developer would be hard-pressed to argue for the construction of a 30-story building in a historical preservation district comprised of 6-story buildings.
I, like a lot of others in this Forum, would like to see more skyscrapers in downtown Fort Worth...mostly for reasons of pride and vanity. That's what makes me puzzled by the seeming humility of some of the prominent stakeholders in downtown (e.g., the three new 6-story office buildings around Sundance Square when a vain developer might have built at least one skyscraper adjacent to the plaza). But maybe they're thinking is more along the lines of environmental aesthetics rather than height hubris.