If Xiaomi devices cannot be unlocked in the future, I will not buy one. Simple as that. Of course the number of people following that logic may be a neglectable metric in the grand-scheme.
While that seems similar, Xiaomi will apparently have higher requirements. It’s pointed out by Kacper Skrzypek, who translates MIUI for Polish users, that Xiaomi will require users in China to reach “level five” on the company’s forums to even apply to unlock a bootloader, limits the number of unlocks per year to three, and won’t allow users with non-China Xiaomi accounts to unlock their bootloaders, at least for now.