I think Assad must be thinking hard right now. Putin is now 69 years old, he won't be living forever. On the other hand the Russian economy is guaranteed rekt and is in a free fall. Russia's ability to support military operations far from home is now under serious question.
If Putin dies (and he will eventually dies). His successor would inherit a Russia with a very long list of domestic and int'l problems. Russia might win in Ukraine but that will be the least of their concerns in the long long run as Russia now will be busy tasked pacifying a country who doesn't want to be part of them or any of their sphere of influence nonsense.
Russia might opt to retreat from the ME and focus whatever power and resources they have to tackle problems at home and on their borders (Ukraine).
For Assad this means trouble. His army is non existent, his air force are so old one can barely understand how they're still flying, not to mention that its pilots are old too. His last victory in Syria are a result of Russian intervention, rebel infighting and the world total blindness to the carpet bombings method of the Russians.
Pull the Russians out and Assad would see his army steadily losing lands again like they did in 2011-2015. If Putin and his eventual successor pull the plug. It's over for him.
Another thing to consider is airpower in Syria. Since 2015, the VKS has de facto replace the SyAAF as the government main air support element. The SyAAF has been noticably more absent than active since 2018. In the aftermath of the war in Ukraine, Russia would now face a strategic environment where NATO are awoken from its deep slumber and re-discover its raison d'etre. Already we have seen Germany adding $100+B special funds for it's military as well as pledge to spend up to 2% of its GDP on defense. This has been followed with similar pledge from France,Poland as well as the UK planning to increase defense spending. In a few years time, the already exorbitant imbalance between Russia and the West would even more skyrocket. Russia is now even more vulnerable from the NATO alliance more than ever. That could mean that the Russian air force would have to re-calculate their deployment calculus to support its homeland defense.
Far from home deployments like in Khmeimin means less and less airframe to defend Russian airspace. Not to mention cost. Russia could either withdraw and rethink its purpose or stay in Syria fighting a war nobody knows when it will stop. Will Russia's pride prevent them to act rational ? Who knows.
One thing that could be very clear is that the Russians myth of military power are already gone. One could hardly envisioned a military deal in Syria where Russia speak from the position of strength.