I believe that bitcoin can reach 50k value. But, it's not for me to witness. I don't think I'll have the opportunity to experience it. I'd rather leave it to my grand children.
We should not be pessimistic, as was the case with the past 2017, that no one thought the bitcoin price could reach $ 7500, even the price once reached $ 19200, the decentralization depends on the needs and the stock market and I'm sure the $ 50k price will happen no more than 2 years from now.
Even some people are expecting to see the bitcoin price trading above 50K this year, because if bitcoin can cross 19000$ in new weeks then it can also be possible that bitcoin price will cross 50k this year. Bitcoin potential is also making it possible that bitcion price can reach to 50k in next few months or at the end of 2018.