I don't think we should despair too much that no attraction has been added - I know AT have an excellent record of bringing in something new every year, but they have no obligation to do that and I imagine it costs a lot to do. Many parks in the world can go for a year without adding something new. That in itself doesn't make Alton a bad park or mean they have failed in any way.
What I would be more concerned about is the haphazard way in which it seems to have been handled. Somehow numerous rumours have spread about new attractions, all of which turned out to be false, but they got people's hopes up. A deal may have fallen through, but it's the park's responsibility to make sure everything is feasible (and in theory of high quality). If the park were trying to install something new and for some reason a deal collapsed, it could be through no fault of the park. Perhaps they themselves decided it wasn't right. Either way, it has reflected badly on the park, in part I think because people expect them to add something new, however small, every year as they have for the last 30.
The situation that we now have is that the park are down an attraction (an important kiddie coaster with no alternative) and I find it unlikely that the park will carry out the maintenance and improvements that so many other of their competitors are able to do in their quiet seasons. This is where the problem lies. If the Beastie was still running, there would be a full complement of rides. If widespread general maintenance was carried out and the park improved because of it, people wouldn't complain. But (and perhaps I'm being harsh here) I simply can't see the park spending cash on things like painting Oblivion and scenery touch-ups because there isn't enough return on it. So we have fewer rides and I think we are unlikely to see the refurbs we want, which is what will cause problems.