Personally, I am using my iPad as my portable gaming platform when I am traveling. The game library is lacking in many ways because the lack of buttons and support from some many publishers but the fact is that I sold my PSP and my DS will be in sale very soon.
Regarding the 3DS and NGP (or Vitae, with you want), I don't think they are in the right track. Battery life is a issue to the 3DS and it will likely be in the NGP. Also, the software library is rather weak so far. The 3DS launch titles were disappointing but I think it will improve until the end of the year. However, it strikes me that most titles don't use 3DS' exclusive abilities to do something greater. The 3D effect can be turned off in almost all games with almost no difference in the experience. The NGP is even worse. It seems Sony is doing exactly the same as they did with the PSP. They are releasing games that provide the same experience as the PS2/PS3 but in a smaller screen. Personally, I don't care for these games as I like to play them in a big screen.
I would gladly give my money to Nintendo and Sony if they provide me with different experiences. I want to see something that only a 3D screen can give or an interesting way the back touch pad can be used to create games I can only play in these platforms. Perhaps E3 will show something of this. Meanwhile, I will be still carrying my iPad in my trips.
