Consolidation among pay TV networks was always going to lead to further consolidation among US TV networks and this week Discovery Communications and the Scripps Network are rumored to be in talks once again for a merger. They have been repeatedly in on off mergers for about 3 years. The overwhelming reason is that when you have plenty of leading TV channels which are known to have audience pull, you have a better chance of being able to land pay TV retransmission deals at the right level of revenue. The story broke in the Wall Street Journal and was repeated in Reuters. Discovery is famous for its Discovery Channels, and other channels such as TLC, Investigation Discovery, Animal Planet, Science…