If one were to buy and hold solid avaerge coins (not a coin that kicks out and gets 10000% gain), but rather a nice steady gain like eth, Ltc etc (top 20) and starts with 10k, is it possible to reach a million without trading and buying/selling at highs and lows? If so, how long would you predict it would take? Or are most coins not going to last long term, so every 6 months would I have to rebalance with newer coins?
It depends on which coin but still it is possible that a coin will kick high up to a Million Dollar. It can happen if the coin has limited numbers to create just like Bitcoin for which it can be up to 21 Million BTC only. Number of investors to the coin. If it is available to the market, the supply is low but the demand is high. If it is easily accessible to cryptocurrency users or multinational corporations and the government totally supports it or not.