LCD displays haven't killed DMDs for me when I play. However, having an LCD display certainly enhances the gaming experience. When I play pinball alone it doesn't seem as big a deal as when I play in a group. I enjoy watching the display (DMD or LCD) when someone else is playing as it improves the experience. As much as I like to play pinball - I prefer to play while having a few cold-ones with a group of friends and in those situations the larger screen helps with making the gameplay more interactive. This is an evolutionary step-forward but it comes at an increased cost - software development. If executed poorly can detract from the experience (not really any different then bad sound, poor voice-overs, poor layout, poorly integrated toys, poor rules, etc. - just one more variable).
I like games that are mode/objective based and I could care less about actual scores. For me it is like a quest (to get to the wizard mode) so for me an LCD improves the journey. For folks that care about competing and scoring I can see how an LCD isn't as enhancing.
I'll keep on flippin as long as the balls are made from steel but as soon as they start using carbon-fiber balls well that's just not pinball. {sarcasm}