So just throwing a few more thoughts as I'm currently at Europa Park and am feeling Wodan is now my number one coaster at the park.
Woodies can be many things; tall, fast, long, short, smooth, rough, exciting and bland. I've ridden wooden coasters that fit all of those and yet they all have something in common. I'm no expert of course, but I look at Wodan and realise...
They're expensive to maintain, much more so than any steel coaster. Manufacturers can do only so much for a woodie, but it is essentially down to maintenance as to how the ride runs after 2, 5 and 10 years. Alton Towers must surely consider this in their planning - a huge woodie would mean much bigger aftercare. I'd rather have a ride that runs consistently well over the years than something that is outstanding at its opening and then awful in five years time. Anaconda at Walygator was so bad it made me hysterical with laughter, as was Bandit at Movie Park Germany. Look at all the woodies that have been RMC'd or retracked by GCI out of necessity, or even just closed/removed because they became so terrible.
There is physically a lot more structure to them, and there is so much more that could impact on the ride experience (Wodan has been WHOAdan all this week because it's hot, but it can be SLOWdan when it's cold).
For the park, SW8 being small may not only be initial budget and planning considerations, but the projected cost over a 10 year period. In this respect, with the hammering the place has taken the last year, I can see why it's of a smaller scale than we had hoped.