Jordan Furlong suggests lawyers and firms conduct an Obsolescence Audit, aimed at identifying aspects of your business that won't survive the next ten years.  Here's his checklist of things to look for:

1.  Any offering that’s the same no matter who buys it.
2.  Any offering essentially the same as your competitors’.
3.  Any offering not optimally designed for client value.
4.  Any offering that really, truly doesn’t require a lawyer.

Read the entire post for Jordan's elaboration on each point.  A fantastic idea!