What about a really spectacularly themed outdoor play area? Something like these:
A colourful play ground with a few static creatures wouldn't cost as much as a new ride and it would have a much larger capacity and allow children to wear themselves out quicker! :P
The indoor play area is naff (and it was when I was little as well) and nothing beats a great big out door adventure playground! :D The Dung Heap isn't on the same sort of scale and is at the other end of the park.
Just a thought.
TBH when they finally get round to moving/selling spinball and restructure the farm/storybookland/Adventure land (I can see them getting rid of spinball, and the big top thing, planting trees about 40m behind it, next to the road there and merging all three areas into an area similar to Nickland, but a bit bigger and have it like a massive all for the young families area with perhaps a large family coaster ( similar scale to Spinball, but better thought out, perhaps a starter looper the niche corkie filled in its final 8-10 years, perhaps like Indiana jones ride at DLP) whilst also encroaching into the woodland behind spinball, a small family coaster (ala Wooden Warrior, but more compact, even if it's just out and back instead of T shaped) and a small junior coaster ala vekoma 207m. Then have all the farm stuff, a better playarea like you said and perhaps one or two more family flats and it would be a really solid family area then.
Regarding CC, the ten year plan said it was a possible coaster site, so it's clear it will get built upon eventually, and it is a good size about 140m by 80m if you don't include all of the staff stuff, but that could be moved/condensed, giving an area shaped triangle of about 140m each side, more than enough room for a solid area. The trees there are of fairly good size with them being about 60ft, however there isn't great depth the trees like there is in Dark Forest which is the only major difference, as the distance from the village is about the same. The land is no less undulating than Dark Forrest's land. This could perhaps be a possible re-location of Spinball. Then I'd like some dark rides there TBH, there's enough room, if you're only entering from one direction you don't want the area to be massive due to bottlenecks and there is good space for a dark ride. If there is only one entrence (logic would say from CCL) to the area then it has to be young family stuff, but if there's a route from X-sector too I think that you could have a higher thrill coaster and one that's not as thrilling to get good balance, but then you'd loose room for a dark ride if you weren't moving the staff portacabins and whatnot.
Will be the next bit of clear land to be built upon IMO if SW7 isn't on the air car park, which I don't think it will.