Well I would think 2 things:
1. The grass patch is not real and temporary, Cars and Villians are proven successful IP and MK needs the capacity boost.
2. Barely anyone bothered to show up for TSI closing, I've seen bigger crowds for both Dinoland/Triceratops Spin closing and ITTBAB. I think its last day truly shows how the public reacted to TSI. It went out with an eh.
I think point 2 could definitely be down to the fact that the "I need to see Good Disney before it closes" have already had their wallet drained over the last few months. Like, anyone who was travelling to see things before they closed has already been really recently because we've had a sort-of-unprecedented double whammy of iconic attraction space closures.
With that said, the map paint-in really highlights a partial reason for this massive project - it really highlights how Mansion and Big Thunder are just dead-ends at the end of a path with no connectivity. To that end, the project will be an improvement - the rest of it, well, we're firmly in "wait and see" mode now, but I'm still very unsure that the lost natural and visual harmony is a worthy sacrifice.