I’m sorry, to criticize the repeatability of Horizons while in the same breath praising Mission: Space is absurd - as is blasting Horizons for being “walk on” without noting that M:S is very often the same and has been for years, which is FAR more damning for a thrill ride with a lower capacity.
But nothing is as disingenuous as hand-waving the health risks of M:S and even trying to blame the guest. The attraction’s entire - it’s ONLY - reason for existence is that it directly replicates a system that is used to put people in peak physical conditions - literally the most fit people in the country - through extreme physical conditions. It’s a cartoonishly terrible idea for a ride and health issues were utterly forseeable.
With the usual caveat that opinions are subjective, Mission: Space is garbage, the worst attraction Disney has ever built. Horizons was the least of the three lost Future World dark rides by a fairly narrow margin, but that’s much more a testament to the greatness of Journey and Motion then an indictment of Horizons, which had more wit, artistry, and skill in its construction then anything Disney has built in decades. Mission has absolutely none of those. It’s a massively uninteresting story told in the most boring fashion possible and coupled with an unpleasant ride experience.
As for “time for a change,” Mission has now existed for close to a decade longer than Horizons did, adding nothing to the park.