The problem imo is that blockchain works well when you have to deal with data that is generated according to certain condition defined by the protocol, for physical / material assets not so much, unless the information can be verified by the whole network which is very unlikely for real estate, and it ends up depending on trusted third parties so blockchain are more going to be a waste than anything.
Having same thoughts while reading the OP. I was calculating the odds on how this tech can really fit in the real world because it does not really connected with it physically? How can one have footprint of the same. I mean even the fossil can be identified for its composition and original date of its survival by means of Carbon Radiology!
But the real estates and blockchain and NFT's? Gosh, so much linking is still pending here and can not be done at proper stance.
The real estate is complex process considering the documentation and who owns it. In my country if they are going to sell the land then they will need to check the acquisition history of last 30 years so that no one can interfere with the purchase or next land owner.
With your calculation our country will need to upload the 30 years of data over blockchain. Possible but not feasible yet.