The topic about Gresham's law has been discussed more than 1000 times on the forum. Just search for old forum threads instead of posting another one.
Saving BTC so much that the value of BTC is lost? What does that supposed to mean? If the value of BTC is lost, saving BTC becomes pointless. The people are saving a currency or an asset because the future value/price of that currency/asset would be higher than the current price. If there's an expectation that the future price/value would be lower than the current price/value, nobody would start saving that particular currency/asset.