Like other asset, we need to spend/use the btc. Otherwise BTC will start to loose popularity. In short term, holding BTC will make BTC more expensive. There will be a good demand and some people among us will buy BTC at very high price. But if we stop to spend BTC in very long term, many people will turn their face away from btc. But I think, this is not going to happen. There will always be a user of btc either a buyer or a seller.