I understand both sides. As far as new players coming in and taking numbers others have worn before, I think the whole thing is that this is a mid-season change not a situation where the number isn't used for a couple of years and then selected.
There are TONS of #10 jerseys out there with the name "Bibby" on them. For a long time, his jersey was the most popular one sold. So to immediately have it become Lue's jersey seems, in a way, to diminish it.
I don't blame Lue; I do, however, understand the people who are disappointed.