If enough people started fighting it, I would imagine that it wouldn't be terribly difficult to overturn, but you would need the support. 

Had a tenant no show the zoom call then claimed they were "late", judge overturned his ruling and allowed for another court date.

The county would refund the investors investment with no interest if the tax deed was overturned. 

I spoke with multiple  representatives and "supervisors", but they claim they don't have the ability to overturn their system's decision.

Having to go into a minefield and retrieve an overturned jet fuel truck with 20,000 gallons of fuel on the airbase.  

You would also have a liability issue from the buyer if the sale was overturned during your land contract period.

Another comment I heard him make is that some of the components of the laws that were overturned had stood for 700 years prior.  

The tax sale was overturned, case dismissed. 

Were people pretty successful in overturning?

I also think it's likely this gets overturned as the city next to us (Ft Worth) is currently being sued over much lighter restrictions.But even if somehow all 600 of those homes were underwater and became forced sellers and they all hit the market tomorrow... it wouldn't even get us to half way of what would be considered "healthy" inventory for Dallas.