Yeah that is the same line of BS they fed everyone about Love Field, but a funny thing happened over time, people came to love the convenience of an airport close to downtown and the government had to put draconian restrictions on it to prevent people from using it.
That's not what happened at all. Before DFW existed, Fort Worth tried to get Dallas to build a combined airport midway between the two cities that would replace the downtown Fort Worth and Dallas airfields. This was Amon Carter Greater Southwest Airport (GSW). However, because the plans placed the GSW terminal on the west side of the property, closer to Ft. Worth, Dallas pulled all of their funding from GSW and sank it all into Love Field. The FAA got pissed because with Dallas not closing its airport, they'd have to indefinitely fund two redundant commercial airports for Dallas and Fort Worth. They forced the construction of DFW and the abandonment of GSW to force Dallas to give up DAL. The FAA was clear on this at the time.
The reason the Wright Amendment happened was because when Southwest started at DAL, the federal government didn't want the city of Dallas to pull out of DFW and put them back in a position of having to fund two separate airports again. That would be more expensive and risk making DFW financially infeasible. By the time it was repealed, it was clear air traffic out of the Dallas-Fort Worth metroplex had grown enough that DFW and DAL could both be feasible.