It's perfectly reasonable to be positive. I'm of the mindset that if it doesn't pan out then at least I had felt some real hope for the first time in a long time.
It's also perfectly reasonable not to be, after all, how many times have we been let down? It's easier to expect the worst.
What isn't reasonable, is to perpetually pour cold water on someone else's positivity when they've already outlined their scepticism.
Frequent positive posts >>> Frequent negative posts