While hodling will benefit investors, trading will benefit the network as trades are carried out. It was for this reason that the famed 10,000 BTC was exchanged for just two pizzas. My argument has always been that if everyone decides not to sell their Bitcoin, no one will have an idea what Bitcoin value is today. Nothing is worth anything untill it's exposed to the dynamics of the market. Yes, Bitcoin will worth more in future but I rather not hodl all throughout without taking profit from time to time and then rebuying at low.