You sound concerned, which is why most people shouldn't asks these questions in the first place. For you, my advice is you need to think the answer to "Why?" Is simply "Because" and go back to entertaining yourself.
All better now!
Really? Because I thought it would produce a paradox given your reasoning so far. If thinking something eventually makes it the truth, then therefore thinking that everything you think is wrong would eventually produce a paradox, where everything you think is wrong because you think it to be so. If that isn't the case, then merely thinking something has no influence on truth, apart from the truth of merely what you are thinking.
------ It doesn't produce a paradox. Can't you tell we're in a reality you CANNOT control by merely thinking anymore? Imagine how we got here.
If you want me to connect the dots, you only have to ask "Is it possible for someone who gets whatever they want and wish for, to eventually sink into a quagmire of a reality where they inadvertently wished for the wishes to take longer to become true?" Especially easy to answer that question if you imagine this person wanted to erect a mental buffer to slow wishes down to prevent them from dying the moment they wished they were dead, say from being embarrassed. Then, you could also wish that your wishes could be manipulated while en route to your position, so you could change them in case you didn't want them.
A latency delay between your desires and their production is only natural.
But if I did think that, then it would become the truth, and therefore I would be affirmed in my thoughts by my thoughts becoming reality, right?
Also, if I think really hard about a vanilla ice cream cone for long enough, will one appear in front of me with no physical explanation?
------ You're correct about the first sentence, but what if we've reached a point where you no longer have more than 50% of your own brain to wish with, and the wishes of your other brain cells are frustrating you? (Other people, for example.) Also, you cannot control your own Id, probably because you wished for that perhaps? The turning into reality point will rely upon, and demand, convincing even your own subconscious Id.
And in regards to Vanilla Ice cream, it WILL appear. But you'll have gone and got it, of course. I don't understand why you are unwilling to connect the dots.
Perhaps at some point, the dots will connect for you, and someone will bring you the ice cream. But you'd never mentally invest that far into this, and you know it.
You have to accept that you're in control but not in control. That is the answer. EDIT: For only just the current hallucinatory moment in this world only of course, this can change if you wish it changes! By no means don't let anyone shackle you down, I'm sorry I didn't inset this edit sooner.
Also, in FURTHER REGARDS TO THE VANILLA ICE CREAM as well as how we discussed the Id of your mind, the more you doubt that this would ever work WHILE YOU WERE WISHING FOR IT TO APPEAR would count against you, so it would never appear at all if you didn't try hard enough...
And that's all because you wanted to hallucinate it be that way. Ta-daa!
In conclusion, there's a reason why successful people advise you to actually envision your achievement of success in real terms and conditions and realistic scenarios. That's what anyone would advise anyone to do in the middle of a massive shared hallucination to obtain what they wanted.