I'd argue today is more like if the Beatles and Stones and Stevie Wonder never cracked the charts or topped out at #20. You picked one week and ignored that 3 of the acts you selected (Beatles/Stones/Stevie Wonder) are some of the highest charting in history on the pop charts.
Beatles/Stones/Stevie Wonder you mentioned had 36 #1s on US pop charts ignoring the countless dozens (100+) of other top 40 hits. Not rock or R&B charts, top 40 charts.
Sly & Family Stone and Zeppelin are good examples though where they didn't chart well on pop charts but obviously objectively great music.
There have always been bad #1s and bad top 10s, but I'd argue with each passing decade good music is less likely to find the pop charts. It started in the 70s with progressive album rock and continued into the 80s with a lot of great punk/new wave rock being more underground. I don't follow a ton of new music but my best friend is a musician in LA and my wife is into it, I like a lot of the new stuff they put on (and a lot of it is by artists in their 20s), I don't like hardly anything on pop radio.
I didn't pick a bad week.
"Sugar Sugar" was the end-of-year #1.
"Sugar Sugar" was the weekly #1 from September 20 through October 11.
So yes, *that was the most popular song of 1969.*
That was a year with albums like, oh...
Let It Bleed
Led Zeppelin II
In the Court of the Crimson King
Everybody Knows This is Nowhere
The Band "The Brown Album"
Willy and the Poor Boys
The Velvet Underground
The Chicago Transit Authority
Then Play On
Crosby, Stills, and Nash
The Soft Parade
I could go on. Nothing off any of those, though. Nope.
My wife has awful taste in music. I'm not even sure she knows who the Rolling Stones are. But when I told her about this little anecdote one time, she sure as **** knew the tune of "Sugar Sugar."
That time Meatloaf went bonkers on Gary Busey on the Celebrity Apprentice. Blows his top at Gary over some paints he can't find then John Rich calmly handles the situation and found his bag elsewhere in the room, LOL.
John actually just interviewed him recently too about his music career
that is hilarious, it was already funny before they found the shopping bag, then I lost it, then fighting back tears of laughter at the shot of him creating art dropping the basketball