Agreed, in fact, I do't see any wrong with long term waiting. The problem i which I saw is what if the coins We hold for is wrong? that's the reason why there is no guarantee in my opinion. But the coins that belong to top 10 in the market has a high chances for us to gain more in long term holdings.
yes nothing any wrong for long term hold some altcoin especially they have good fundamental in future, but the problem usually come from internal, sometime maybe they need money and forced them to sell the asset even market condition is bad