Depends on how you define instant. If it's around 4-5 years, then yes. If by instant, you mean a couple of months/a year, then NO, it's NOT!
No doubt Bitcoin price can sky rocket at any time but it would still need a couple of years to appreciate and generate enough revenue for you to become a millionaire. However, if you just wanna sell it for smaller profits, then it could be a good investment option for you IMO.