The thing is, the name itself is inappropriate. No one would call someone of native descent a redskin, and yet the team is essentially doing just that when you look at the meaning. The whole thing is contradictory. Even if those of native american descent didn't find it offensive for the team to be named the Redskins, I would still want it changed because it's just not an appropiate name. As I said earlier, if the team was name the Washington Coloreds, the name would be changed.
I also believe in this hypothetical. Let's say there was never a team in the history of sports with the name Redskin. Then let's say Los Angeles finally got a football franchise, and "Redskins" was a possible title choice for the new team. How many people would find that inappropriate, how many would be okay with it?