Merlin don't want the park to fail. I'm sure some people believe that they do, but of course they don't. I do agree with what has been said about them no longer being confident in the park recovering to its 2010 popularity levels, so therefore they don't see the need to go the extra mile to attract that extra million. Reduced costs to accommodate lowered guest levels.
And yes, June 2015 changed things drastically and probably forever. The cuts at the beginning of the 2015 season, with Dark Forest opening at 11 and Hex opening at 12, were not anywhere near as drastic as five moth-balled rides, and six hour long off peak days. This is purely a result of the crash, as whilst cuts would have continued had the crash not occurred, I doubt they'd have ever got to the level they're at today without it.
And yes, June 2015 changed things drastically and probably forever. The cuts at the beginning of the 2015 season, with Dark Forest opening at 11 and Hex opening at 12, were not anywhere near as drastic as five moth-balled rides, and six hour long off peak days. This is purely a result of the crash, as whilst cuts would have continued had the crash not occurred, I doubt they'd have ever got to the level they're at today without it.