I don't think it will be delisted -- it had 1.55 BTC volume today alone, so it should be fine for a 0.2 btc average over 7 days.

The profitability of mining most SHA256 coins is below the ones we already have, nearly all the time - so adding more coins doesn't provide any gain, because of losing efficiency with coin switching. (Counter-intuitively, having dozens of coins on an algorithm is actually harmful for that reason.)