Yes and I think most people were in favour of changing the fan survey to do that, but then people disagreed on what would constitute 'tanking'. More importantly changing the fan survey to cut into the tanking teams' earnings is not as easy as changing the values in the salary floor calculation.
That said, D1 in decently sized nations did indeed need a higher floor, irrespective of fan survey changes because the differences were simply too much. When you have 3-4 teams at 300k-350k or so and the rest at 600k or more it's not so much fun and you can understand how much difference it makes to earnings. To add insult to injury one of these teams, with the money from tanking, bought players before the playoffs and won a relegation series, imagine that...
In order to counter the reluctancy to mess(technically) with the fan survey, there were proposals that didn't have anything to do with it..
Once a week, during the economy update there could be a calculation run(like the overextension tax does) that would deal with tanking, by reducing (percent of)that week's TV income, based on the parameters calculated.
Pretty simple math required, provisions for all worries of injustice and levels of penalties can be included.
The answers were like "nice, but can't code it"...then Utopia was born...!!!!!
"Where there is will, there is a way"... and after so many different proposals and so many different denials,all these years, i tend to believe that the answer may just be that they simply don't want it changed.