I would love an updated SX740 and a new GX7IV. Keeps the existing lenses, update the sensors, add DIGIC X, update the autofocus, and a touch screen for the SX740. I can dream but I don't think it will ever happen.
I could go for a PowerShot Super-Zoom, akin to the old ones. I had one that used AA batteries and there's certainly demand for that from the "Go places and take photos!" crowd that wants something more versatile than a smartphone and less clunky than a DSLR or mirrorless equivalent.