Since I have had mobile phones with upgradeable OS's, I have seen these threads over and over again. Not once in the last 8 yrs have I ever seen a company upgrade due to customer pressure. If they plan an upgrade its trumpeted from the highest tower as part of a sales pitch.
My suggestion is dont waste your time waiting Iit'll never happen) but go install MIUI to get all the features you want. HDMI "out" does not work but its a small price to pay for a magnificent OS running 2.3.
Ive been on MIUI since September and Id never go back