When did the transition to mainstream status, marked by cultural ubiquity, appear to solidify?
Answer
The late 1970s and throughout the 1980s
The transition to mainstream status, defined as the average household owning multiple items featuring the fastener, solidified across the late 1970s and throughout the 1980s.

Related Questions
Who was the Swiss engineer who first observed the burdock burr mechanism?In what year was the patent officially granted for de Mestral's hook-and-loop creation?What two French words form the portmanteau that created the name Velcro?Which material did de Mestral initially experiment with that proved inadequate for the hooks?Which material finally demonstrated the necessary resilience for the hooks to function reliably over many cycles?Which organization was the most famous early client for Velcro adoption in the 1960s?Where did Georges de Mestral make the observation that inspired the fastener in 1941?Under magnification, what did the burrs reveal that inspired the mechanical fastening concept?When did the transition to mainstream status, marked by cultural ubiquity, appear to solidify?Which two groups primarily benefited from the early fashion integration focusing on convenience?