Syrian Conflict Outcome Major War Will Follow

The peace talks collapse and they (the superpower nations) already know the outcome before the peace talks. The United States is supporting the rebel against president Bashaar Al-assad government. The rebel forces which is lacked of funding to win this war will vanish against Assad's government because today the Russian has been giving high tech weapons against the rebel.
In a broader scenario, the Israel will not allow those weapons because the Hezbollah which is the major threat of Israel  will now has the opportunity to hold those weapons. The Israel keep bombing any suspected transportation to Hezbollah because they knew that if that weapon is on the hands of their enemy then sooner or later they will use it.
Now, if Israel which is an ally of United States will attack those weapons and how about the retaliation against Hezbollah. If Hezbollah will retaliate on those weapons attacked then Assad government will declare war against Israel. If the happened then the Russian will not also allow the United States to intervene those war. If the United States will defend Israel so Russia will also defend Syria.
Things can't be predicted and if both superpowers on war then welcome to World War 3. World War 3 would be devastating, once either side use nuclear weapons then the other also would retaliate. This could be the end of the world.
Right now peace talks between rebel and Assad government always failed. If they can't negotiate immediately, broader clash is the outcome in this civil war.