"Slow yield" is, IMO, a good thing.  (the opposite of recent deep water find which peak quickly and deplete almost as quickly).

We have a crunch in production, prices force adjustment, and we end up with roughly the same production in a few years.

Growing reserves, declining production (if true) is a good step towards an easier transition.  A gentle downslope.

IMO, nonconventional US natural gas production is to conventional US natural gas production as nonconventional oil production worldwide is to conventional oil production worldwide.    

In both cases, nonconventional production will primarily serve to slow the rate of decline of total production.