1. 1 BTC = $1 Million by December 2020 John McAfee
2. 1 BTC = $250,000 by 2022 Tim Draper3.
3. 1 BTC = $100,000 by December 2018, Kay Van-Petersen
4. 1 BTC = $25,000 by December, 2018 Tom Lee
5. 1 BTC = $20,000 by December 2018 Pantera Capital
Which one is more realistic and do you think it will come to past?
All individuals who are just looking to sell the top. These people aren't interested in Bitcoin as currency or store of value, so why should we even care about their opinion? Tim Draper is somewhat of an exception since he has been a Bitcoin advocate for years, but also very much hinting towards the investment aspect.
The only thing I see these people talk about is that Bitcoin will reach this or that level, where is the utility? Why are they not recommending people to use it as money? If I introduce Bitcoin to new people it's all about money and store of value, where the investment aspect is just a (positive) side effect with how small Bitcoin still is today.
If I have to choose one option anyway, then I'll be on Tim's side. I would however lower it to $100,000 in all honesty.