XRP will not disappear or drop to 0. What exchanges (Kraken, Bittrex, Binance, and others) are doing is delisting XRP as a precautionary measure, not because some court has asked or ordered it. It is a measure that exchanges (only those that have their headquarters in the United States) take unilaterally to avoid problems in the future. Foreign exchanges will not have any problem now or in the future because they are not in the United States and the SEC cannot do anything.