I have read similar studies, one indicating that, after varying and unspecified periods of AAS use, all males tested had regained full HPTA (or HPGA, as it was called in the study) function after a year off of AAS.
However, like MG said, people's HPTA's vary so much, it is very difficult to predict the effects of any such substance.
Some men reportedly (though i have never read a study indicating such) have become hypogonadal after a single cycle, while others seem to recover almost no matter what.
If you DO become hypogonadal and are put on TRT, many of the adverse effects (such as increased risk of heart disease, stroke, lipid issue, depression, libido issues, etc.) will be offset.
In terms of infertility, this is a possibility, but is not definite. TRT (properly administered) should not cause infertility, and can even recover fertility lost in connection to hypogonadism. It depends on what type of hypogonadism you are suffering from (which part of the HPTA is damaged or severely shut down), but working with a skilled endo, you have several routes to possible recovery.
Nonetheless, blasting and cruising has such risks, along with others tied to long term AAS use.
There are also a lot of helpful members on here who have more experience with both blasting and cruising (I have none), and TRT (again, I have none).