The paradox to which I pointed.
Fair enough, but what made it difficult for you to make sense of?
Just because there is a physical reality now doesn’t mean there always will be.
Physics is a science, and sciences are structures that can be broken.
The only way there will not be a physical reality is in the sense that the heat death of the universe will eventually happen in a very long time from now — but you want to kill humanity now.
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Gravity will pull you down, regardless of what you believe.
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The OP is obscure in explaining what reality is. If reality means perception, then of course it will end itself at the moment of death of the body. No force is required.
If reality means something eternal and physical universe, then it cannot end logically. Because only things which have started can be ended. No one knows the reality has started at some point, or has been there before starting. Or whether if it is some process or just stillness.
It doesn’t elucidate what the start of reality means. It doesn’t say anything about the ending process either.
One thing for sure is reality is not a game.
But reality does not mean perception. 
To some folks, it is. What is your definition of reality?
That means you do not believe in any kind of shared reality, that reality is solely what we sense, and that anyone else has an existence too is imaginary.
Not imaginary. But inferred.
Thanks for the term anti-cosmicism. I don’t understand the OP. I can’t tell whether you’re suggesting some kind of grand narrative about entropy or talking about personal disengagement and suicide. Or neither. I think I need more information.
Off topic. But perceptions can be mistaken, in which case they are not perceptions of reality. Obvious stuff.
Nor need the physical universe be eternal - endeed, presnt cosmological theroy says otherwise. And it ain’t stillness - it changes.
Both, from what I can wok out.
We infer others’ existence, emotion, will, thoughts and intelligence by their visual appearance, action and linguistic communication. It is not imaginary.
But if there is no consensus reality, then everyone else is just a figment of our own minds, who will vanish from existence when we die.
Illusion is also part of reality. Cosmological theories are largely speculation.
That is the case in reality. The dead vanishes never to return, and gets forgotten. The world is silent.
The problem with the view that everyone else is merely a figment of our imaginations is that then there is no need for concepts such as morals, because everyone else is just a perception in one’s own mind and does not actually exist as such.
Never said everyone else is merely a figment of our imagination. That is your imagination. Everyone is duly perceived existence with their own minds, which are the result of my reasoning and inference from their appearance, actions and linguistic response.
Your keep saying on “a figment of imaginary” even after my denying posts makes me to infer you could be a Bot or AI. 
Maybe the die-hard idealists would say everyone else is a figment of their imagination?
I am not an idealist.
So you accept that other people exist, and they are not merely part of your own mind. That implies that at some level ‘reality’ does exist, even if you only have access to perceptions of it mediated through your senses.