The congestion on the Ethereum blockchain based on the application popularity of the Cryptokitties app is a major step forward for product-market fit for Ethereum, and is a buy signal.
This is an additional demonstration of the distributed/decentralized app use case for Ethereum, beyond the funding use case of ICO's.
Renowned analyst Geoffrey Moore and co-author Paul Johnson wrote the epic investment book, The Gorilla Game: Picking Winners in High Technology back in 1999, and its message holds true today. It speaks to the investment value of buying, holding, and adding to investments in a "Gorilla" that is dominating a platform industry.
The data we are seeing today on Ethereum is a strong indicator/validation of its "Gorilla" status under this model.