I can't find much on it that's reliable but how often has the choice been put in the tribes' hands for these changes? And if a team or school did make the change, has a tribe or Native American community been able to collectively make a choice for what the replacement should be?
For example, although it sounds like it's still controversial within segments of the tribe, the leaders gave their blessing for Florida State to keep the symbols present, which imo is how that should be done. I tend to be around people that live to be outraged for others without realizing they're doing the same exact thing in a different way and it's kind of a weird conversation to have.
It's generally even more complicated than it might seem. The notion of "choice" from a Tribal perspective usually amounts to a vote from your respective Tribal Council who has personal interests to consider including, but not limited to: clan affiliation, opposing factions, alliances, compromises, private business interests, political considerations, fundraising, working relationships with the Federal Bureau of Indian Affairs, etc.
Speaking from experience, I've come to find corruption, exclusion, vendetta, and bias are not foreign concepts to Tribal Governments just the same as any other, unfortunately. Every tribal entity, as well as every collection of individuals, is different. Some are "better" than others, in that respect.
Furthermore, from a general election or referendum perspective, at least on the OST Reservation at Pine Ridge (which is one of the larger and more populous Tribes/Reservations) factors such as alcoholism, drugs, poverty, abuse, intimidation, distrust of authority, bitterness over historical injustice, etc. limit democratic access/participation and severely impact turnout and representation in any result of any election or referendum,
so I question the validity of statements like "X tribe approves or supports Y school or team using this name" in general. All I can meaningfully tell you doesn't amount to much more than I don't mind the mascot names and I don't know any Natives personally that do.
I'm just not sure how you meaningfully quantify how 47,000 generationally disenfranchised people (many of who are deeply distrustful of basically all Western institutions
including elections, referendums, or representatives from their own Tribe) feel about Indian mascots that are spread out
not only on a 1.7 million acre Reservation, but also spread out nationally and even globally in some cases...
And that's just one Tribe from one Reservation.
Ironically enough, I feel like the United States has a long track record of being perfectly fine with making decisions for Native People with little to no meaningful input from Natives, and why should whether or not to use Indian mascots not be just another one those decisions?
However, not having the input non-native Americans want or need in order to make an informed decision on Native's behalf DOES NOT absolve the US and non-natives from the responsibility to make the right decisions, nor does it absolve non-native Americans from blame for making the wrong ones. In this case or any other, for that matter.
Such is the burden of quasi-genocide and imperialism, unfortunately. It's a messy business indeed with no easy solution. Hardly shocking, if you really think about how one would go about settling a continent with tens of millions of people already on it. But you do the crime, you do the time, so to speak. It really is crazy how it happened and how little it's talked about. Just crazy.