Brick and Mortar retail has been dying across the country for the last 5 years+, and covid really helped push that along. Why in the world would Disney want to lean into a dying market space and build MORE retail space. Its not like there is NO retail spaces in MK (just taking this park as the example.) And other than special dates, like the opening of the 50th Anniversary, or a new item launch, I have never seen the retail spaces currently available at MK being so crowded such that they are turning people away, or that shopping in them was a hardship. You don't need a Genie+ spot for the shops on Main St.
And its not like Disney is afraid to sell things to people to try and make money. Does anyone really think that if they thought that additional retail space was in demand, and would result in more sales, that they wouldn't explore it?
In addition to 1) there being no real demand for more retail space, and 2) no monetary incentive or ROI to spend on more retail space, there is 3) is more retail space, or a new sit down restaurant really going to solve the problem of long lines at the high demand attractions. Take 7D, lets say out of 40,000 guests per day, 30,000 want to ride 7D. Those 30,000 riders are in line for 7D throughout the day, and lets be honest, for the high end attractions, absent the very last moments of the park, the lines themselves stay rather long and static the entire day. Are we really thinking a significant number or people are going to NOT wait in line for 7D, and go to a third or fourth merchandise shop? Your much more likely to have people choosing between riding Tron and 7D.
And finally, the major problem with this thinking is you are not truly asking Disney to spend money to increase capacity, as it is generally used. WDW has a capacity of 40,000 guests per day, if your investing capex to increase capacity, you are spending money in order to increase that 40,000 guest number to 45 or 50,000 per day, with all the corresponding revenue that entails. What many people on this board want, is for WDW to spend capex to NOT increase capacity, but rather distribute the same 40,000 guests across more areas/activities. So you are asking for a large capex spend, and increase in overhead, with no increased consumer base and direct ROI.