If a device could produce the following would you like to see it all in Skydemon at the same time? 

• GPS Location
• Traffic:
• P3I: from PilotAware equipped aircraft.
• ADS-B: from an ADS-B Out transponder
• Mode-C: from a Mode C transponder
• Mode-S: from a Mode S transponder
• FLARM*: From a FLARM transceiver*When in range of an OGN-R transceiver
• Weather:
• Radar Weather (cloud and rainfall)
• METARs
• TAFs

And can do the following in an companion App on the same tablet

• Weather:
• Other data such as Lighetning, Infrared
• Communications:
• Onboard SMS and Email

@hamish

Heaven forbid Europe gets a similar level of capability as our US cousins do.

Yeah I think the answer is always going to be something that gives enough results now whilst not ignoring the future. A combination of cellular and VHF gives the cheapest route for the consumer, with the backup or satellite if and only if needed.