Taxing unrealized gains will be extremely complex, and given that they aren't allowing us to deduct unrealized losses its a pretty shitty setup for the taxpayer.
We need to drastically simplify our tax code rather than further increase its complexity.
I pay taxes on the unrealized gains of my house appreciating in value over the years.
I'm not arguing one way or the other about whether various wealth tax ideas are good. But, I don't believe that the concept is as infeasible as some are making it out to be when it's been happening with property taxes for a very long time.
You pay taxes on the assessed value of your house. It doesn't matter what you paid for it, or how much equity you have in it. It's more of a use tax than a capital gains or wealth tax.