Bitcoin is not safe atm, due to the volatility of the price. But in long term for sure it will be. Laws of the market - demand and supply - always determine. Bitcoin has become increasingly popular, and nothing can stop it now.
If nothing, Bitcoin has shown how quickly can it become red hot with this run. One of the next runs won't stop at $500, but it will shoot up right pass $1,000 and continue much, much further!
So everyone get in while it's still cheap so you wouldn't regret it later!