British billionaire investor Jeremy Grantham has argued that Bitcoin will gradually lose its significance over time and that, in the long run, its value could approach zero. Speaking in an interview on CNBC, Grantham described Bitcoin as non-functional and highly speculative. As a co-founder of investment firm GMO and well-known for identifying financial bubbles, Grantham reiterated his warnings in his latest assessment of Bitcoin. Instead of a sudden crash, he predicted a slow, prolonged decline in value stretched across several years. Grantham believes this descent will not come with dramatic collapses, but rather through a gradual drop in relevance.