If the price per barrel goes too low, fracking will become too expensive to be worthwhile. There is a debate on what exactly that price is, but the numbers I've been hearing range from $50 to $80 a barrel. There are a lot of jobs in and connected to that industry.
................For the present the drilling will continue , daily rental for drilling rigs will or should decrease because some producers will cut their rigs loose when the well is completed . The drilling in south tx in the Haynesville shale may see a small decrease in the rig count .
................Most savy lessee(s) include a clause in their lease that requires the producer to start drilling before the end of the lease term or they lose their lease . So , the producer drills atleast one well so the lease is 'held' by production . As far as the effects on fracking , producers keep drilling wells , they drill , set pipe , cement , perforate , and log the well , then they Wait to frac until the price comes back up .
................Those companies with sufficient capital resources and lots of undrilled leases will actually INcrease their drilling activity because their costs of drilling decrease when the market price per barrel drops as it has recently .