My plane flies on pressure and air flow, not strict mathematical geometry. I prefer an altitude with a relationship to the physics of flying, not artificial rulers and dividers. If I get a QNH is does not only tell me about heights, it does tell me more on the things I have to expect when piloting - it connects to your guts feeling. I prefer an intuitional connection to the air outside.
I think you get to keep your ASI for a while longer...
There’s nothing wrong with knowing the surface pressure as well but for vertical navigation, accuracy and commonality are important for separating aircraft from each other and from the ground. CAT III GBAS is due in a year or two which is amazing progress for aviation. Ever since GPS was invented it has been accurate enough for en-route navigation.
Better not mention FBW!