Integrated HDD: Interesting concept but I'm not sold on it being a good idea. It's adding a layer of complexity a modem/router probably doesn't need by moving more into the media server realm. Then they'll be ongoing support for failing drives etc.
Integrated TV Tuner: Again interesting concept but again not sold on it - I see a few problems with it. Would it be one tuner serving one TV or multiple tuners able to serve multiple sets? How many tuners should there be - or would this be catered for by bigger, better faster, stronger models? Would it be capable of time shifting and/or recording programs (probably not without an integrated HDD)? How many channels should it be able to time shift/record. Then there's the interface. Needs to be simple but effective. Needs to have high WAF. What will the control mechanisms for changing channel be if you're watching VIA and HDMI cable etc?
External Aerial/jack: Great to have!
Combined, the first two items above would be moving the device firmly into a media server arena, which is not in itself a problem, but the associated installation and support costs need to be factored in as well as the initial outlay for the consumer.
The point has been made that a lot of people won't have lots of DLNA devices etc - these same people are also not going to be able to afford the outlay required for a complex piece of machinery. They probably also don't want to be running lots of cables through/under the house (especially HDMI) when they can have aerials close to and an STB in (if the TV's don't have built in tuners) each room.
On the other hand I'd also argue that having an integrated system would be be good from a consumer point of view and, as we've seen with the convergence of other technologies over time, it probably will come. My question would be - would people actually be able to use it? There would have to be a great deal of R&D put into making a simple, effective interface with a high WAF. There's a lot more to consider than just making the world's most fancy whiz-bang machine... If it's crippled through bad interface (or locked down interface like Tivo) uptake just won't happen. Same with restricting market availability - once again, like Tivo.
For now they'd be better off having having a modem/router sticking to its knitting but have several USB inputs and a decent amount of (8+) gigabit capable ports.