We honestly need EVERY decent player of arrangers to start bringing the Chord Sequencer to the forefront of manufacturers' consciousness. It isn't really a feature that benefits the beginning player, as he rarely has a LH capable of more than the chord input anyway, but for the more advanced player, the amount of sheer REPETITION the LH has to do is tragic.
So, you aren't going to hear a litany of calls for the feature from THEM, it is going to have to be the more advanced player that brings it to their attention. And as we are probably well in the minority, that means we ALL will have to make the noise!
Simply put, if you have a decent LH, if you like soloing expressively using the bender, if you play ANOTHER instrument (guitar, sax, accordion, another keyboard etc.) a Chord Sequencer or Chord 'Looper' (for those that might be thinking that the CS is an offline process, not something you do live) is one of the handiest things you'll ever get. It blurs the boundary between being spontaneous in arranger mode and being rigid in SMF song mode...
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An arranger is just a tool. What matters is what you build with it..!