I think it will be the new era in the crypto currencies market, because if Bitcoin dies, there will be a new leader on the market and altcoins won't depend on BTC anymore. I think the altcoins will moon as soon as this happens.
Regarding BTC, you said everything correctly and I also hold about the same opinion, but I think that it would still be better to say that this will not happen, since btc today has global publicity and many people understand what it is.