It's a personal and subjective thing of course. But I'm not sure that a 'game changer' or something hugely deep etc. is what I would want Elektron to make next.. or maybe it is, who knows?
My personal experience:
I learnt to make music (if that term makes sense) originally on an MC-303, then moved onto computers - which never agreed with me. I don't like having a computer screen involved. Then I started to play the keyboards properly and learnt a bit of guitar and bass. So performance aspects have become much more important to me (though I still like a good old straight sequenced tune once in a while)
Years ago I got a Machinedrum UW - love that thing. So inspiring, incredible sounds - and all digital. It's fairly straightforward in comparison to the other machines, but at the time was pretty deep for a drum machine - yet still the great thing was you could get great results right off the bat. Fantastic bit of kit, maybe my favourite thing Elektron have made
I only ever played once on a Monomachine, the sequencing was very natural to me (having learnt to make music originally on the 303) and quite similar to the Machinedrum of course. The synthesis was a complete mind melt - though I didn't have time to explore it. I always had the feeling that I would have fallen in love with it if I'd ever got my hands on one.
I got an Analog Keys a couple of years back. I'll admit I have a love / hate relationship with it. Actually hate is too strong, I have a love / meh relationship with it! I do not find it as inspiring as the Machinedrum, though of course it is a very different beast. Truth be told I don't believe I have truly explored it enough yet.
Next I got an Octatrack. After a few months of being convinced I'd utterly wasted my money I suddenly started getting on with it. Then I discovered it's MIDI sequencing capabilities... and just recently as a looper... and it has found it's place now as a performance tool, in some ways I simply had not imagined. It's a complete nutter really - really loving this thing now, and I'm finding it very inspiring indeed. I get excited just to power it up at the possibilities, same as the Machinedrum. Really hoping I get to this point with the Analog Keys at some point!
My Machinedrum started to develop some quirks as it started to show its first signs of old age, to the point that if I treat it right I can use it for recording, but sadly had to retire it from live use. Instead of getting a new one I invested in the Analog Rytm (really wanted an analog drum machine anyway). To be frank I have not spent the time with it required to get to a proper judgement.
I tried out a Heat and the pedal version. They both sound great, but they are too expensive for what they are in my opinion, so I decided I can live without. The Digitakt also doesn't float my boat - however I do have an Octatrack, Machinedrum and Rytm - so I think I have those bases covered.
I am also not a fan of the smaller footprint - I am probably in a minority on that one though!
So what was the point of this over long and frankly boring story? Well, the machines I really love from Elektron INSPIRE me - and this I think can be applied to any musical instrument, it is the key factor.
So I want Elektron to make something that inspires and feels good to play. What that is, I do not know!