I think 2018 will be a turn in crypto world, and yes I agree all shticoins will disapear, however I do not share your idea about dogre which is for me shitcoin wiht no future
Top 100-250 Coin's are a safe bet and maybe Top 10-25 as well.
I see you aren't doing crypto long enough. Go to
https://coinmarketcap.com/historical/20130630/ and tell me which of these coins are in your pocket (except for btc and ltc)? Exactly: none. because they're all gone or worth next to nothing. You aren't 'safe' with the biggest coins. Especially in an overbought and hyped market as crypto. In fact, your chances of earning serious money are bigger if you research enough and invest in something good that isn't even near CMC. THAT will give you x10000, not just by buying soemthing that already went x100