OK so some great points in this thread but one or two that I am familiar with are slightly off target.
Warehousing space is just storage - like any other type of storage.
The next stage of ‘online’ is Interpolating technology into this arena.
So, for example, products will be produced and shipped and orders will be met from the already shipped stock, so that required product will be offloaded and delivered directly to the customer - cutting out the sitting-in-a-warehouse stage.
Additionally disruptive tech similar to shipping containers will disrupt land transportation.
A widget off the boat from China will be loaded onto a truck in Portsmouth or Cork and, by the magic of computers, will meet and transfer to another truck - in motion - that is closer to the destination.
So robotic trucks will advertise (and alter on demand) their routes. They will carry, transfer and receive product - while on the go - to and from other similar units.
Storage will be less in demand, not more.
More immediately, here in the UK there is a big problem in Pensions.
In particular private pensions - those who manage their own pension funds.
At age 55 some pension fund holders can withdraw - tax free - I think its 20% of the total value of their pension. as many of these pensions contain property this has a big effect on the tax free grab!
So if I have 100k cash and 100k property in my pension, I can with draw 20% of total valuation, or £40k.
If my property falls in value by 50% - and this must be assessed by a professional surveyor - I only have assets of 150k and can only withdraw 30k.
Scale this up to multiple millions and multiple properties and you can see a problem emerging.
Some UK banks requesting 40% deposits on certain residential mortgages should give you an indicator of the direction we’re headed.