As great as bitcoin;s are for store of value, they sometimes have to be used in order to create more economic output, which means spent
.
At a certain point in time this would mean bitcoin collapse.
In a timeframe where mining reward is only fee from transactions, if there was such a case of only store of value, and no transactions, the mining would come to a halt
and it would tear the whole thing from the ground up.
Please note that a case like that is not going to happen, there will always be transactions and trading, but if major part of people use it as store of value, it would extremely increase its value i guess.
cheers