Well, you might feel that since Bitcoin has surpassed $6K level, you are late but as far as I believe, I think everyone who is buying Bitcoin below $10K is an early adopter. I am considering Bitcoin as an investment for at least next 10 years and thus at this point, there is still opportunity for anyone who is willing to enter in Bitcoin. However, please do your own research before making any investment decision.
So what the price is going to be in 2-3 years? If those who buy bitcoin below 10k are early adopters, you bet bitcoin is 100k+ or even higher? Why will it be so expensive?
I think, all that growth that we see now is because of the hype. All that mass media, usual people who didnt care about investments before get to know about that extra growth and so on. Stories about pizza for 10k bitcoins and 7k for 1 bitcoin today.
The next step may be is appearing of institutional investors in crypto world. One more hype may be. But finally I dont see any big reason for 20k+. It totally depends on speculation. Actually price can be 100K in 2 years or 2K. Who knows.