The important question is: how likely is this to change the results? In recent decades there's been a trend for the Best Picture Oscar to wind up going to films

The important question is: how likely is this to change the results? In recent decades there's been a trend for the Best Picture Oscar to wind up going to films which may not be all that good but which are seen as "Oscar-worthy" due to weighty subject matter or otherwise "seeming smart". Historical dramas have made up something like twenty out of the last thirty years' winners, including such so-so films as Braveheart. No comedy has won since Shakespeare in Love (which was acceptably smart-seeming because it had Shakespeare in it) and before that it was Annie Hall (which, incidentally, beat Star Wars). I wonder if preferential ranking will improve the quality of winners by better reflecting the true preferences of the voters rather than the preferences the voters seem to think they ought to have.