Well then as difficulty decreases, you simply buy a few of these bad boys, plug em in to pc and start mining your very own bitcoin!
Easy peasy!
...oh wait a minute....
If hashrate falls, I imagine these will become a hot selling item...
https://www.amazon.com/dp/B07ZDLKC44/ref=sspa_dk_detail_5?psc=1&pd_rd_i=B07ZDLKC44&pd_rd_w=FfvJu&pf_rd_p=45a72588-80f7-4414-9851-786f6c16d42b&pd_rd_wg=EpCf7&pf_rd_r=QE4RVCH2DR9FPHS9RFYE&pd_rd_r=254c46de-42cf-40b0-a111-9ab2eccb1b96&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExMlZLRTJaUzhVNTAzJmVuY3J5cHRlZElkPUEwODk1MTczMUlQMFUzVVdHRDFZUCZlbmNyeXB0ZWRBZElkPUEwNTg5ODM1MU85SUQyUFoyR0ZPUiZ3aWRnZXROYW1lPXNwX2RldGFpbCZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=