If the price goes back down again to around $4000-6000, people will be able to buy whole bitcoin, I know people can buy fraction of bitcoin, but buying whole is a better deal.
Why do you think a whole bitcoin is better?
What is important is the value of your investment in dollar.
And there are still many people can buy a whole bitcoin at the current price and even if the price drops to 1000 dollar, there will be still many people cannot afford to buy 1 bitcoin.