You have to remember that the likes of blues and punk have a far greater history than post-rock. In any genre there is going to be a lot of traits that get repeated and similar artists or just straight-up copycats but in a thriving genre there will be bands that bring more to the table and continue to breathe life into it.
In post-rock there are stand-out artists that keep it interesting and although I haven't listened to a lot of it this year, I started to get tired by what I saw as the sheer number of bands popping up all doing the same thing. If the genre suddenly gives birth to a flurry of bands who all feel like taking a few risks then it will probably benefit greatly. Post-rock doesn't have 60+ years of experience to fall back on.
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