It's not just music. Technology makes everything easier, so naturally people don't put in as much effort as they used to. So we end up with this tidal wave of generic crap because we have technology covering up people's lack of actual talent, so any pretty blonde with big tits can at least take a stab at a music career these days.
That's not to say all music today is lazy, or that all previous music was fantastic. It's just easier to be exposed to the cheap knock-off garbage these days as a result of the ubiquitous nature of the internet and the media. It's got a silver lining though. It's also much easier than ever to discover new bands with actual talent via the internet. These days there's something for everyone, you just need to look beyond the surface layer of low effort crap.