Different stages of Syrian conflict:

Syria's situation is very changed from the initial days of "Arab Spring" and continuously changed from one phase to another. Nation wide protests to armed resistance of Free Syrian Army, then rise of Islamist armed groups to the rise of ISIS, Rebels controlling most of areas to losing it to ISIS and then Pro-Assad forces. ISIS fight against Kurd militia groups and US led coalition's campaign against ISIS, Fall of ISIS due to fight against rebels, Turk, Russian, Syrian,Iranian, US and Kurd operations against it and rebels defeats from ISIS and pro-Assad Syrian, Iranian, Hizbollah and Russian forces/militias and losing of vast areas, Divisions among rebels which led to infighting and rise of Islamist groups in Idlib and defeat of pro-US ,Pro-Saudi and Turk rebel groups from Syrian Islamist and Jihadi groups and now compromising with Turk intervention against Kurd in Afrin and retreating from many areas of their last strong hold Idlib. That's the phases Syria gone through but what's coming next? that's the real question and I will try to find the answer.

What's coming next?

Turk Kurd conflict:

Turkey's operation in Afrin is going on with the help of some FSA and other rebel groups on the ground and Kurd's sponsor US is not supporting them to fight against Turkey as US don't want to lose Turkey as a NATO ally to Russia because Turkey is coming closer to Russia after US support of Kurd militias in the region and military failed coup against Turkey. Russia is now trying to perform the role of peace mediator between Turkey and Kurd are both apparently trusting on Russia in their ongoing conflict and it shows Russia's political success in the region after US failed in political moves the region.

Future of Assad government:

It seems like that there will be no removal of government or Assad from power nor the free elections will be held in near future in Syria. Pro- Russia Assad government will remain as they now politically winning the situation with the help of their allies Russia and Iran and after lost of US interest in the region, Turkey is also helping them as Turkey convinces many rebel groups for peace deal with Russia and Assad.

A possible peace deal:

In near future, a peace deal between Assad government and most of the rebel groups is possible with the help of Turkey, but it will not stop the armed resistance from various rebel,Islamist and jihadi groups and this could change from open warfare to guerilla style warfare after losing ground to Pro-Turk rebels or Pro-Assad forces in Syria.

Future of IS inside Syria:

IS will remain as a strong armed force in Syria. The conflict between other forces will give advantage to this terror organization and IS will sure try to capture areas in the future even if they lose it within few days. IS modified itself into a guerilla force and already successfully carrying continuous operations against almost every group or power in Syria.

Syrian Rebel groups future:

Rebels will divide due to Russian and Turk sponsored peace deals with losing more areas. Many rebel groups will directly become dependent on Turkey and few other opposing groups will either chose to leave the ground and start guerilla operation or will be defeated by Pro-Turk rebel groups in order to maintain peace treaties with Russia and Assad government. There are very high chances in Syria of future guerilla style resistance from some of rebel groups who are not dependent on any of foreign powers and Jihadi groups like AQ will not surrender against peace deal.

Other possibilities can be a Kurd vs pro-Assad fight for oil resources or another rise of IS, Turkey's game changing moves in future etc.
So my final conclusion is that unfortunately, Syria will remain in conflicts in future.
Images source: 1, 2, 3, 4, 5, 6.