Dark Matter as Axions as 85% of All Matter?

Sabine Hossenfelder in Exploding stars made of dark matter could heat up universe informs us about some new speculations about the physics of dark matter, believed to make up 85% of all matter in the Universe, in the form of    

• axions or axion particles 

able to form 

• axion stars

able to explode and so able to  

• heat surrounding gas 

which could be a detectable phenomenon. Sabine ends asking how it is possible that physicists can be paid for this kind of speculation. 

Compare with the idea I have suggested that matter with density $\rho (x,t)=\Delta \phi (x,t)$ is formed from a gravitational potential $\phi (x,t)$ locally in space-time with coordinates $(x,t)$ from differentiation expressed by the Laplacian differential operator $\Delta$, and that dark matter corresponds to large regions where the potential is smooth in the sense that $\Delta \phi (x,t)$ is not large enough to create matter which is visible. 

It is conceivable that such large regions could concentrate gravitationally and even form stars which could explode as in the above scenario. Is anyone willing to pay for this idea? Does it make sense?