This is just filled with misunderstanding. The purpose of mining is not to give intrinsic value to Bitcoin. It is to economically incentivize a fair system of transacting without centrality. The cost of mining is the price the Bitcoin system pays for distributed, trust-less consensus.
Just like fiat, Bitcoin has no intrinsic value. Just like fiat, Bitcoin is a bubble that seemingly never pops, because it is a collectively imagined means of transacting. A discussion of the disadvantages or advantages of Bitcoin should start with this understanding.