Why would tablets be the future of computers? At home I have a 22" widescreen standing on my desk, in what way would my computing experience become better by me

Why would tablets be the future of computers? At home I have a 22" widescreen standing on my desk, in what way would my computing experience become better by me carrying that around? Why would Apple successfully design the thing the right way? They have a good track record, but past performance is not a guarantee of future performance...