It all a matter of political will, not incapacity or inability of our local governments. Strong political will to build transit have pushed forward multiple tax measures in Los Angeles, which has enabled it to expand its metro rail network by over 40 miles, and add 30 new stations, since 2016 including 3 newly opened D Line heavy rail subway stations. The city's rail network has expanded by almost 50% in just 10 years.
The interesting question is, will other US cities, especially sunbelt cities follow? Besides LA and Seattle (which itself has significantly expanded its Link light rail system over the past decade), few other cities are pursuing major expansions of rapid transit. The most glaring example is in Texan cities where highway expansion is continually prioritized.