There's one thing I neglected to mention in my first post to answer the original question. The reason why it will never be as explosive as it was from 1950ish to about 1970 was the there were no rules or boundaries. That's why it was so fertile back then. Rock and Roll didn't exist until blues and country guys started playing louder and faster until Ike Turner came along with Rocket 88. Then, there was a new sensation, and it was all new territory to explore.
Back then there could be so many diverse styles of songs from one band. Singles were the norm, and you wrote and recorded what you hoped would be a hit. At the same time, English kids listening to Armed Forces Radio also discovered the Blues and early rock and roll. Skiffle started and by the late fifties, England had its own answers to Elvis and Bill Haley in Cliff Richard and Johnny Kidd. Hank Marvin summed it up nicely when he said "We were playing songs about picking cotton, but didn't even know what the plant looked like." They changed the Shadows to be more British and have their own style. It worked, and influence many. A few more years go by, and now the world is seeing two types of rock and roll develop in the US and England. Because of the lack of definition, by 1967 you're seeing such masterpieces as Surrealist Pillow, The Doors, Fresh Cream, and Are You Experience. All very different albums with differing styles from song to song on each record.
Also because of the lack of boundaries, you saw jazz guys like Baker and Bruce get together with Blues guy Clapton. Jazz guys Densmore, Krieger, and Manzarek get together with a beat poet, folkies Kantner, Balin, Kaukonen, and Casady with artists Dryden and Slick. And the list of cross pollination musical and artistic styles goes on through the seventies. It wasn't until after King Crimson and The Nice influenced a bunch of German musicians along with advances in technology that we saw the development of Prog and Kraut rock.
About that time, there was the separation of Acid and Prog, and then the whole world of genres with genres, within subgenres began. All the while, it's still rock and roll. But, it was still uncharted territory. The eighties was probably the last of the completely different musical styles. R&B has been neither rhythm or blues since about then. There are so many genres of punk, I can't count them any more. Most of what's out there now is a re-hash of older stuff. It's the gifted who make it sound new, different, or enticing. Will we see something come along that will smash down walls like Ike Turner, Cream, Hendrix, Blue Cheer, Mountain, or many others did? Who's to tell. Maybe we need something as unpopular as the Vietnam War to get people to use music as a rally cry as they did in the sixties? Maybe break up the monopolies that only want to sell you a soundtrack to their products? Mabe move in the direction John Cage did, and explore semi-tonal music? It's out there,, the songs are in the wind. It's up to the right people to find them, and deliver them to everyone. I keep looking for my own voice to hopefully write something that brings joy to others.