You're thinking about this development and it's impact on you, and that's ok, we're all a bit selfish over what we want the parks to build.
The reality is that a park full of headlining thrill coasters doesn't survive. The coasters are extremely expensive to build and maintain, and they alienate a large portion of the population that are either under the height requirement, don't like the thrill\upside down\G-forces associated or have medical conditions that prevent them from riding.
While this doesn't in and of itself mean the coasters wouldn't have a bunch of people queuing to ride them - it's the rest of their family group that aren't interested in visiting.
Even the big thrill parks Stateside with the most coasters in the world still have smaller attractions, kids rides, family rides, flat rides, small fun coasters with minimal thrills, and honestly - this is the gap Movie World is filling. Magic Mountain and Cedar Point both have well rounded rosters and not everything has to be a record breaker.
Road Runner can't be ridden solo under 120cm. it's 110cm with an adult.
Spongebob solo is 110cm, 90cm with an adult. I think Kansas Twister is going to fall somewhere in between those two and it lowers the bar for kids at Movie World, plus it offers a "less thrilling" rollercoaster experience for the adults who don't like being balls to the wall.
Unfortunately too many people have lost their heads (literally) entering a ride envelope when they shouldn't. Our safety rules require fences that prevent opportunistic entry. Wild West Falls used to have a gorgeous themed timber post and rail fence but too many people were climbing the fence to retrieve hats and what-not and so the big pool fence got put up instead.
I don't see that there's much difference between these fences and the ones at Jet Rescue or Storm... if anything this mesh is a tight diamond rather than the standard 'cyclone' mesh at Sea World, which IMO looks nicer (though it probably makes it harder for the die-hard photographers to fit their lens through the gaps). We're also seeing the view from the back of the land, and i'm sure there is more attention paid to the optics from the 'front approach'.