Yes, Arlington voted to spend the money on the new ball park as they did on the stadium for the Cowboys. So Arlington, not even the largest city in our county (by far), is home to an NFL and an MLB team. I guess maybe the Cowboys' home is really Frisco, where Jerry Jones got both the city and the school district to share costs in building the Star, the location of the Cowboys' training and office facilities.
I have lived in Fort Worth for 15 years now and rarely go to Dallas.
As baseball looks to expand, Texas could provide support for another team in the San Antonio - Austin area. Both are major US cities (San Antonio #7 and Austin #11 in US) close enough to support a single team. I do think Nashville may have the inside track for a team but I question if expansion is likely anytime soon. The set back due to COVID this year may have put expansion off for many years.
Although metropolitan areas are really more important, I always have enjoyedlooking at the ranking of cities by their population. Fort Worth has moved from 19th to 12th since I have lived here. Arlington is 48th on this list.
The 200 Largest Cities in the United States by Population 2020