Hard to say conclusively Bob Dylan and Brian Wilson might not have moved things in that direction regardless. Both influenced the Beatles as well as being influenced by them.Without the Beatles, pop music would have never gotten trippy and philosophical.
But record companies would have eventually figured out how to put hot people on an autotuner and sing about partying and sex. Pop music in 2021 would be the same, just actual good music would have diverged from popular music much earlier.