Vortex is a very popular ride there is no reason it should be removed but I think it should be modified. The trains should get lap bars it would be more comfortable. Adventure Express is also a popular ride and it should not be removed It's a great ride for kids and adults. I would miss Adventure Express if it went. Just because a ride is not tall or fast does not mean It's a bad ride.
It's always a walk on for me...? I do doubt Vortex will get removed but one can hope.
If you want it removed don't ride it. Sometimes rides can be a walk on and that doesn't mean there not popular. I have walked onto Diamondback 6 times in the middle of the day and Diamondback is a very very popular ride.
As for Adventure Express that is a popular ride the lines just move fast but it is a kids ride and a amusment park is not all about thrill thrill thrill. If Kings Island removed Adventure Express I would be dissapointed and a lot of other people would be too.