Many cool projects for sure, but the majority of these projects will be failing miserably. It's part of the exploration phase that we are in and for that reason it's not a safe bet to hold anything other than Bitcoin for that many years. Some would say that Ethereum is a good hold as well, but I'm not really convinced of that with how it relies on ICO's and air drops mainly. On the other hand, it also shows how little this whole crypto thingy has offered thus far. If through all the years only Ethereum managed to successfully grow out to a giant, it perfectly shows that there isn't much usefulness to the rest of the 2000 or so coins and projects.