1. Many altcoins will never reach their all time high again.
2. Don't be fooled by altcoin ranks on coinmarketcap because many won't stay in top 20 anymore after we go deep into this bear market.
3. History have proven that many altcoins will be replaced by new ones and that's where huge investors will be making most of their gains in next bull market.
They all seem to mean the same thing, to be fair there are great altcoins and altcoins that have lost the position they created after the hype trends. During the bear market, most altcoins lose their value, and this period will create a purge of really strong projects that will survive and continue to grow in accordance with the targets set before.