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?
the best method is to use cost averaging. For example put $100 every Friday in Eth. That will give you $400 per month initial investment x 12 months is $4,800 investment. This will likely be double, triple, who knows with mass adoption. Better than sitting in a bank account certainly

by all means do your own research. Feel free to check out ZCashGold too