Something That Can't Go On Forever, Won't

This is true and in the case of big law firms, they may be right.

But on the flipside, I'm very wary of big proclamations about the future.  The ozone layer, global warming, peak oil, nuclear war, the end of the movie studios, etc, etc.  I think people tend to underestimate how much the world is in constant flux and change.  We tend to allow emotional feelings such as general anxiety about the future or distrust of a particular political group to unduly influence how we feel about the future.

When big events happen (ie Black Swan events), they happen all at once and usually are not predicted. Afterwards, we look at the events and it seems obvious we should have seen it coming, but we hardly ever do.