Less jumpscares? I can't say I agree with that. In regards to appealing to a wider age range, there's other areas of the park ala Cbeebies Land & Walliams World to entertain that audience - Duel/The Haunted House/Whatever the hell it's set to be named next is located in an area of the park containing thrill rides, therefore to place a tame ghost train there would not look right.
To me, it needs much more jumpscares - and good ones at that. I think i've only been genuinely spooked by one jumpscare in Duel, the rest I felt were extremely predictable they didn't even make me flinch in the slightest, or were so well lit you could see them from across the room.
I think they should go all in for a really eerie, spooky ghost train. There's not many decent ghost trains in the country, so why not put the new Haunted House on the map?