Bitcoin's purpose isn't for investing. People might choose to invest and speculate on the future value of Bitcoin but, among other things, Bitcoin's purpose is a currency that is decoupled from a central government.
For now, Bitcoin seems to be taking shape as a store of value, like gold. Another, more updated crypto currency, might take over as day-to-day currency while Bitcoin is the larger value store.
Hard to say how things will shake out but it's surprisingly still the early days of crypto technology.