YANBU.
I sincerely hope that house prices do fall. Why? Because those of us in our twenties and often thirties were sold a lie by the generations above us.
Go to school, get good grades. Work hard. Go to university. Get a good job. Work hard. Then you'll be able to afford at least a reasonable standard of living.
I did all of that - mid 20s, good degree from a Russell Group university, professional job, earnings above national average. DP is the same. We have to live in London, as that's where work is, and the same opportunities in our sectors simply don't exist outside of London. We looked at moving further out and commuting in, but quickly realised that with two of us commuting into central London, any savings on rent would immediately be eaten up by the extra cost of commuting, so we're financially no worse off living in inner London (it's not an especially glamorous area, for the record - very socially mixed). We have no family in the region (that is, none within 100 miles of London) that we could live with while we save up.
We live in a very small one bedroom flat. Yet, this flat is (Zoopla tells me) "worth" £350k, and rising. Mortgage calculators tell me that to get a mortgage where we could afford the repayments, we'd have to come up with a £150k deposit. Fat fucking chance.
My desire to own a home has nothing to do with getting rich off the back of it, or watching my investment grow. It's about security. At the moment, our landlord (a baby boomer) could evict us on a whim at 2 months notice - we need not have done anything wrong. I would like to be able to paint the walls in a colour I like, not the landlord's bland magnolia. And I would even like to be able to have a pet without having to ask the landlord. These are basic things that my parents take for granted. And are they really unreasonable?
I could not possibly bring a child into a situation where we do not have a reasonable level of security in our living arrangements. Quite apart from that, we couldn't afford a second bedroom for the child, let alone childcare, the extra food, the clothes and so on because so much of our money goes on rent. I very much doubt that we will be able to afford this at any point before my ovaries pack up, unless my parents die young and I inherit prematurely. There's a large number of people in my situation - not a single person in the office I work in (>30 people) has children, and we're all graduates in good jobs. There's going to be a whole generation of us born in the 80s and 90s who will simply never be able to have children - and then who will pay for our pensions when we get old?
So no, OP, you're thoroughly reasonable for hoping that house prices will fall, because while some may find themselves in negative equity and will not be able to move so easily, at least people of my generation will have half a hope of having some security and the basic standard of living that our parents experienced.
And yes, I'm voting Labour, because I do not see any hope for me or my generation in the Conservative manifesto.