If it's something Bethesda feels they can do well and without much hassle I think that's great (even though I own neither system). However I think porting Daggerfall to another platform would be very difficult, which makes something like this very unlikely.
Since Morrowind was never ported to the Playstation 2 I think it's unlikely Bethesda would be interested in porting it to a Playstation handheld, and that's assuming the PSP2 has the hardware to handle it - with memory being the big question here instead of graphics.
Vir2L has developed for handhelds so it wouldn't surprise me to see a new Elder Scrolls Travels from them on one or both of these platforms, and it also wouldn't surprise me to hear about an Elder Scrolls game for Smartphones. But I doubt we'll see ports of old games.