Whether it's pure wishful thinking I won't go into here. What I will say is that situations are always changing. Nothing ever stays exactly the same. But even more important, what can be changed is the way we interpret our life to be at this time - this 'Now' Time.
Most people dwell in their minds, thinking of the past, thinking of the future, then using a positive or negative attitude to determine how they feel now. What is wrong with the absolute moment - this moment - is the important thing. Is there anything wrong with it?
What is wrong now? Can I accept it? (this moment, not the imaginings of a future which might never happen) What can I do about it? Can I side step it? Go around it? Ignore it? Deal with it as best I can NOW.
In that figure of the man resting on elbows on table hands on head is a depiction of body-language. If this were real, and the man sat up straight, the body would affect the mind. The improvement in mental state would change. Whether his outside situation would change is not the point here. Content or discontent lies WITHIN. Look after the within.