Do you have an evidence to back up the first sentence?
The X1D seem to have all been sold
As for dealers having stock sitting on the shelves, those people probably went out of business.
I was in NYC last year and B&H had some Hasselblad stock. That is the only place I have seen it in a long while. You always have to order. Even the distributer in Sydney (+4M people) does not have stock there. They have it in Melbourne and ship it up as required.
I bought my X1D having never held it. I bought my last Canon the same way.
Have the people queuing up outside Apple Shops to buy an iPhone on launch day tried it before?
Welcome to the 21st Century.
If you read the test results, specs, user guide and reviews you probably know more than the dealer anyway.
If you are lucky you can try them at roadshows.
I don't have evidence, I have anecdotal discussions with multiple dealers and I pay attention to the folks around me. I've seen/chatted with many 500 series shooters, and there seems to be a mental block to purchasing a back for more than $2,000 or there about. People won't do it - there's always an excuse. Ever read how polling numbers go - no one ever says they'll vote against a school levy, but somehow the levy either fails or barely scrapes by the 60% required. People say a lot that makes them feel good, but when it comes to cash on the table they make other decisions. I know that the local rental shop is doing great business renting out their 503cx'es, and they'd be able to rent out a CFV-50c II more than a few times, but the cost of the unit prevented them from risking the investment.
Order your 35mm gear site unseen and have fun - you can resell it for a minimal loss, as the marketplace is 500x larger. Same with the iPhone, though no one has lined up for the last number of years - these are consumer electronics.
MF gear, especially when you look at $10-50k purchases really need to be held in hand. There is no other way. Ask a dealer what the return policy on a Hasselblad - they'll get any issues fixed, but it's yours. It's a market that requires a lot of user experience & understanding to be successful. Having stock is different to having a demo or a rental setup. I don't expect to see a set of HC lenses just sitting there, but if you purchase today, you'd walk out with the one from rentals and in 1-2 days when yours shows up we would swap. That is what a dealer does. If a dealer doesn't move enough Hasselblad, or can't support a rental kit, how are you supposed to handle an emergency equipment failure? Spares? Demos? It's why I see the dealer relationship as so important.
Camera stores I've chatted with order gear in 1 of 2 ways: cash up front for inventory, or on terms based on the sale. The camera store makes more money on the resulting sale when they do cash up front. There are downsides for dealers when it come to rebates, where they have to wait for the mfg to cut then a check. When they sell on consignment it's not like there is money on the shelf, but what then end up with as a margin is significantly less.
Buying a camera, especially your first medium format camera based on a review is the worst possible decision. It's either a puff piece from a mfg rep'ed photographer, or a reviewer who doesn't shoot MF commercially. It has to work in your workflow, with your methods & you'll most likely have to change how some things are done. The only way to do this is with experienced support.