Libertarian movement has decayed

a. one branch split off into Ron Paul-ism and less savory alt right directions

b. a more establishment branch remains but commands few new adherents  

c. established libertarianism has not solved major problems like climate change

d. internet  encourages some to have synthetic, eclectic views

e. out-migration from traditional libertarianism, especially of educated women, has been severe

f. 19th century classical liberalism became inappropriate after ended WWII

Classical liberals and libertarians evolved State Capacity Libertarianism. 

State Capacity Libertarianism propositions:

1. Markets and capitalism are very powerful-should be respected

2. Strong states, which maintain and extend capitalism/markets must keep
    national hegemony like China at bay, keep elections free from foreign interference,
    protect intangible capital/intellectual property, and manage the new world of the internet.
    Maintenance and extension of capitalism are primary duties.

3. Strong state is not a large or tyrannical state. 

4. High rapidly developing state capacity is not inherently tyrannical. 
    Rapidly developing Demark has a large government and is free and secure,
    albeit not for everybody.

5. Some America failures come from excess state regulation, others from state capacity.
     Examples include climate change, K-12 education, traffic congestion,
     quality of state discretionary spending, maintain physical infrastructure, manage
     immigration. All require state capacity not appropriate for classical libertarianism.

6. See Stubborn Attachments: A Vision for a Society of Free, Prosperous, and Responsible Individuals.

7. Recent East Asian living standards growth has centered on capitalism/markets.
    State Capacity in both the East and West dramatically improved Public health.
    State Libertarianism accepts such progress while preferring more markets/less government.  

8. Geopolitical problems have center on Africa and South Asia. Both lack markets and state capacity.

9. State Capacity Libertarians advocate better infrastructure, science, nuclear power and space programs
    as compared to mainstream libertarians and modern Democrats. Modern Democrats usually favor
    redistribution, egalitarian/fairness concerns, mood affiliation, and traditional Democratic interest groups.
    Modern Democrats running New York have done little building and fixing.

10. State Capacity Libertarianism has no problem endorsing higher quality government and governance.

11. State Capacity Libertarianism advocates alliances with other relatively free nations.
      Example: US foreign policy has resulted in Asian Pax Americana  predominating.
      The libertarian anti-foreign intervention continues because governments make mistakes.

See Tyler's essay on the paradox of libertarianism