My family and I are some of the people who used to go to WDW regularly, once or even twice a year for full vacations until about 2011. Between nostalgia for better times and some decent discounts in the 2010's, we still enjoyed our decreasingly frequent trips there, but the factors you mentioned plus the increasing complexity and stress of a WDW vacation threatened to tip the scale for us into not wanting to return. Now we haven't been there for almost 3 years and have no plans to return soon, because those factors overcame even our immense nostalgia for a Disney vacation. We prefer to be treated better for a lower price, which is now true for just about any other tourist destination, many of which are a closer drive for us. We used to consider WDW to be the best vacation value, but no more. I don't think our experience is unique in this regard.
At this point it would take far more than a percentage off discount to bring us back. Maybe things will change in the long run and it will seem a desirable destination again for us, and I still frequent this site for indications of such a change in favor of guest experience, but unfortunately that kind of news is sparse these days. I do think offering discounts on rooms or even park tickets will alleviate low attendance somewhat in the short term, but for us, long term improvements in the guest experience, in addition to discounts are required before I even consider taking time away from one of the beaches to go back to WDW.