"There is no doubt that any bets on the possibility of Al-Assad's regime surviving in Syria are a delusion because the survival of the regime poses more of a disaster to its supporters than to its opposition. This is because it has become a black hole that absorbs all of its supporters' resources and credibility while giving nothing in return. The Iranian government was sectarian and politically exposed and it lost the support of the people in the region due to its support of the regime's atrocities. Iran also lost Hezbollah by involving it in the quagmire. If the regime survives, it will only behave worse, thus increasing financial and moral cost for Tehran. This will only make Tehran drown, just as the Soviet Union sunk in the Afghanistan quagmire.
The continuation of the current situation in Syria would be impossible without Western support, and it will not continue since there is no desirable benefit in exchange for this support. The dangers that resulted from the survival of the Syrian regime and its policies did not occur due to a lack of support, but rather from the magnitude of the support for it. More support will only drag the West into the regime's quagmire without actually lessening the harms of its survival. It will only mean more displacement for Syrians (and perhaps even the Lebanese as well) who will head towards the coasts of Europe and contribute to the destabilisation of the area.
Whatever the case, the issue was decided with the launch of Turkey's equivalent of Saudi's Operation Decisive Storm which aims to seize areas under Daesh's control and hand them over to the moderate Syrian opposition. It also aims to create safe zones for both the opposition and the civilians. This will lead to creating conditions conducive to hastening the process of overthrowing the Syrian regime and secure a suitable alternative. Therefore, the "end game" will mean the end of the Assad regime. The wise in Russia and Iran understand this and are trying to turn this catastrophe into a gain before it is too late."