I would be happy to see DSI produce enough different modules so that one could build an all-DSI modular instrument.
Honestly my old friend I would like to broaden your views a little here. The eurorack scene is so large with so many options that its not a question of one manufacturer doing one perfect set of modules but rather a question of picking the best sounding oscillators, filters and amps together with relevant support modules if one is in traditional mood. Or something entirely different if one is in that mood. Read this great Mutable Instrument owner interview by KMI for additional inspiration:
http://www.keithmcmillen.com/blog/interview-with-olivier-gillet-mutable-instruments/
What a well designed preset manager module with enough features could enable is a design-it-yourself voice architecture. Or simply be the hardware side of a setup enabling generative sound design techniques being employed without having to reach into the cable-and-knob-salad all the time. Different approaches, different dreams!
Oh, it's not at all that I want to limit myself only to DSI products. After all, I did start this thread about the Voyager because I'm genuinely interested in Moog synthesizers. But I would be happy to see DSI get into the module approach large-scale.
You've heard me say this before. My needs are very simple, but the thing I cannot find is the large yet relatively simple synthesizer with strong fundamentals, including multiple VCOs, multiple LFOs, complete envelopes, a full-sized keyboard, and so on. There are so many instruments nowadays that fall short of this ideal. The Sub 37 is one, for example. So close and yet so far; a fabulous sound and architecture, but just too small. The same with the Prophet 6. Honestly, I keep coming back to the old Prophet '08 as an ideal. It's very difficult to find that old school-ish synthesizer that doesn't compromise on the basics. So, the best solution seems to be to find a synthesizer that's generally satisfactory and has the right physical size, and then to supplement it with modules.