And for demos and presentations (yeah its part of developers life!) a laptops perhaps. I also hope that tablets replace laptops just like CRT was replaced by LCD/LED.
CRT was replaced by LCD/LED because LCD/LED was better. You can't replace laptops with tablets becase they can't replace laptops. You can't type in the same way, they're smaller so you can't cram the same hardware into them, etc. So it's apples and oranges.