I think bitcoin is still growing and day in and day out more people are getting to know about bitcoin but it's too early to call for the maturity of bitcoin right now. Let's give ourselves the next 5 years because some of us are still still finding away way through the crypto industry
I believe those people who predict that Bitcoin can reach many thousands in the future. I do not know what is "mature cryptocurrency", but BTC has a lot of time to grow and to become even better than now.