It is possible for bitcoin to drop to altcoin prices but not this year. It is highly unlikely for btc to go down to those levels if mass adoption of it is increasing everyday, generating more demand for it. Invest on bitcoin if you want but you better do it on dumps for cheaper entry points. For now I think the chance of this happening in the next 5 years is less than 1%. Do not be afraid to invest into btc, but before you do make sure to research the mechanism of holding btc safely so that your funds would not be lost in the process.