You have to pay more for "secure display" capabilities but such devices do exist.
Well now that might work - if it can show the amount of the transaction before it signs it.
Then again most everyone these days carries a mobile phone, so a phone + near field communication is probably the more "killer app".
Yes this is another natural evolution of such a solution, I have worked on several "virtual" smart cards in my career some of which use phones. That said right now the phone doesn't offer great security,just consider all major phone platforms now have malware variants of their own.
This approach, at least today also doesn't provide the same mitigations, they can be thought of more as a portable flash drive; though to be fair Much of the value of a smart card is getting the keys off the host and these virtual smart cards can have that property. Developing one of these, at least one with reasonable usability and security properties requires platform work from the phone vendors that has not been done.