There are no technological difficulties whatsoever. In fact Casio has produced a camera with a small remote control precisely for off-hand controlling. Adding a remote control to any device is obviously has a very small cost, even non-technical people will agree with that.
Same goes with adding of USB port and TV-out. All of these things were implemented on a simple devices which could cost very cheap. Tv-out for example was realized on many mobile phones, but it's use was always limited because of the lack of a remote control (thus the person had to sit close to the TV, limited by the length of the cable) and they wouldn't include all possibilities for connection to TV, which are mainly composite, component and HDMI cables.
Therefore, I still within my point, the proposed hardware improvements are not costly and very easy to implement.
Regarding software, it varies. For example including support for data storage encryption on the fly support may not be mandatory at all. It's just that I think many people will find it very useful, and some will be delighted to purchase the device for this feature alone (since it hasn't been implemented in a mobile phone yet).
That means that point could be used in advertising as well. And probably this feature will allow the mobile phone to stand out and get some special attention, including in the reviews of CNET for example.