The problem isn't whether or not you're using the same computer hardware
or software thirty years from now.  The problem with the 2038 bug is
with financial forcasting and banking software.  Let's say that in 2009,
you decide to buy a house on a 30 year mortgage.  Wouldn't you like to
know that the computer that is used to compute your interest and payment
schedule would understand how to do so correctly?

That would be my 2-cents, and perhaps a whole lot more.

Chad