Without numbers both you and I are just grasping at our feelings. That said, the technology to make music "cheap and accessible" enough to displace live music "thus allowing people to have unlimited music" has been around since at least the early 1900s with the creation and maturation of the record player/phonograph. I don't think this is a new phenomenon. This "killing of live music" would have happened long before the Beatles were even born.

Further improvements in portable audio like the cassette tape, the CD, and eventually digital music only improved the portability of music for individuals but commercial settings have had the ability to replace live music at venues for a century. I don't think the root cause for the decline of live music was technical. I think cultural attitudes toward music changed, that's all.