OK, as a non-musician but big classic rock fan of a certain age, my take:
I have a saying I use with my youngest who is the biggest music fan of my three boys: "The Beatles are everywhere". Even 50+ years later (starting with 1970 when they ceased to function as a unit). Up until the 1980s they weren't everywhere. Their songs were not available for commercials and they basically only existed on what was then called AOR radio and to the extent your local TV station or cinema showed Yellow Submarine or Help or Hard Day's Night. John didn't tour. George toured once. Paul toured but until 1976 didn't play any Beatles songs live and even when he did it was sparse. Four I think in his big 1976 tour. Then it slowly started to change. I'd say John's murder was the first moment. All of a sudden the Beatles were front page news again. Then George had All Those Years Ago which for a minor radio hit was played a ton on MTV. Then you had the posthumous John album Milk and Honey which was unusual back then and a bit of a curiosity. Then finally in the late 1980s Nike got a hold of Revolution for an ad. George complained but what else is new.
As media expanded so did the Beatles profile. With DVDs you could get all their movies. Finally. Their fight with Apple Music helped as well. In 1989 Paul finally started to embrace his past even if George could never deal with it and Ringo just wasn't capable at the time (he was a semi-functional alcoholic). Then the people my age started to move into leading roles at ad firms and in movies and TV. We all grew up with the Beatles. Not quite first generation but in the 1970s and 1980s they were still THE BEATLES to just about every DJ and music personality which sort of stamped them in the collective consciousness of folks who are now in their 50s and older.
So now, you have the Beatles in spots that I'm not even sure the users of the idea even realize it's the Beatles. Example, our local library had a a summer reading program for kids that was called something like "Reading Altogether Now". No way that was coincidence. Wendy's had a "strawberry fields" salad a couple of seasons ago. No way that was coincidence. Check any town map in the US where development is still continuing. There will almost certainly be a Penny Lane. There's one in my town. Sometimes you see the font or the colors from something like the Love show or the day glow Let It Be poster used in other graphics. It's there if you know what you are looking at. Their music has seeped into movies and TV. Guardians of the Galaxy 2 featured a George song as did the TV show This Is Us. Another George song in the movie Goodfellas. All You Need is Love in Love Actually. That recent Yesterday movie only exists because they thought there would be enough interest in Beatles music 50 years later. There have been a number of commercials that have used newer versions of Beatles songs made modern and more like a commercial jingle.
I can understand why someone who is more interested in listening to aggressive music might find them uninspiring. Same for someone who like rap. If you don't know who their contemporaries were you would not get just how amazing they were at the time. It's like the Godfather. My kids think it's a slow movie. They can't beat to watch 2001. To slow and boring.
In another 100 years the Beatles will be consigned to music history books for the most part, but whatever service delivers music will still have them available and any history of the 1960s will be incomplete without them. On some level they will be like classic music is viewed today. Important and still heard at times.
I'll add
@guitarguyvic for reference since he commented earlier.
