We’ll have to agree to disagree, I guess! 
TSI became but a shadow of it’s former self. I remember as a kid the place was so full of people, and they were running 3 rafts constantly over there. Aunt Polly’s was always open. But recently, it is like a ghost town. Very underutilized. Sure, it is fun to be over there…but Disney needs capacity, and TSI just became a waste of space. (And I’m someone who ADORED TSI as a kid.)
The Liberty Belle was, as I said, boring (and with almost no seating to actually allow it to be “relaxing”). Sure, what you point out is true…but again, I think the new land (even if Cars wouldn’t have been my first choice) will be a huge improvement in terms of land use and improved capacity, spreading out crowds. The preliminary artwork suggests it will be a beautiful change, including new/improved water features, rather than something you pretty much just walk past to get from, say, HM to BTMRR.
Sure, there are going to be SOME people who want things to stay as it was…but so far, most of the time when Disney has replaced something “beloved” with something new, and I was a naysayer about it, I ended up loving the change (not universally, though). So, I’ve become much more open to changes/improvements.
I watched a video put out by a former Imagineer who lamented the loss of RoA and TSI, and he went into great detail as to why. But…I felt his logic felt completely flat (and he was seemingly completely wrong about a few claims), and actually he convinced me that holding onto it would be a mistake.
I’m still unsure if I think Cars works there or not. But…ultimately, the change, regardless of what went in there, was necessary as a means to get to what everyone is ACTUALLY most looking forward to: Villains Land.