Chances are quite good, Sander

Look at the progress that has been made in discovering stellar-mass ultracompacts since the start of the MACHO microlensing project.

The LIGO/VIRGO gravitational wave project has the potential to discover many more black holes when their sensitivity is upgraded.

The rapid development of research on Fast Radio Bursts is extremely promising.

Microlensing research may have more big discoveries in the future.

Then there is the potential for a breakthrough in dark matter research that has not been considered above. For example, an X-ray background survey that is at least an order of magnitude more sensitive than what is now possible has the potential to reveal hordes of galactic and intergalactic PBHs slowly accreting matter from the interstellar medium and the intergalactic medium. This would provide irrefutable proof.

Even if astrophysics is not your thing, you could still skim the whole paper to see what the 7 arguments for primordial black hole dark matter are, and the ways this candidacy is being tested.