The golden opportunity is over but I would be surprised if there are not more good opportunities. Bitcoin right now is around 16k and it won't be a smooth ride on the way back up to the previous ATH just below 20k. If bitcoin drops to 14k or so again it's a good buying opportunity.
The opportunity to make a lot of money with bitcoin is over as the price has risen a lot,now we have to check and look for opportunity in the alt coin market to make a fortune ,but if you have the capacity to hold bitcoin get in and hold for a long time,who knows what the price would be five to ten years from now.
No one really knows because bitcoin's character was extraordinarily has an impact to human race nowadays, and with regards to the corrections it has right now it will not stop unless people end their investments of bitcoin. But I don't think the current situations affecting the price which people speculates a lot about it was not with speculations behind, but the reality on how every person need and spend money for their family specially those things that they spend like buying what they wanted to make themselves happy.