Can't see any of these big increases TBH. Lots of jobs going to disappear in the next couple of years,fans will pick and choose the games they attend.You mention Wigan averaging 15,000,going up to 20,000.Why?
Wigan playing their best and most successful rugby for years,surely anyone remotely interested in the club will already be attending.
I can see attendances standing still or even dropping at many clubs. Clubs will have to come up with cut-price deals on tickets if they can afford it.

Tut tut tut, no being positive on the VT please!

Wigan will push towards 20k and further in my opinion, Ian Lenegan's way of getting his vast amounts of money is to promo the club and get bums on seats. When the Wigan Athletic bubble bursts, the RL club will prosper from that.

I understand the point about jobs and money being an issue, but everyone will want recreation and if this means stopping paying 45 quid to watch a boring football game and go watching an rl game for less than half that and with most clubs doing great season tickets for families, i know what i'd do. A Man Utd die-hard fan has already said to me that he could have bought a Salford season ticket for him and his daughter for the price he paid for just him to go to 3 Man Utd games with a few beers thrown in.

The point about Wire and Hull increasing their gates is an interesting one. Both clubs worked hard to increase crowds prior to moving with cut price deals, cheap tickets for kids accompanied by an adult etc and both have reaped the benefit. Salford do not appear to have done anything to boost attendances, instead relying on the possibility that a new stadium will be the catalyst for success. It won't happen.

Salford have had cut-price tickets for certain matches.
Wire's gates have also increased because of the policy of signing big name players which increases expectancy and creates a "buzz" around the club before the season starts.After a few seasons of disappointment,in the last couple of seasons this seems to be paying off.
Hull have also brought in big name players which has kept up the expectancy for the fans.
Salford don't have the money for such signings,therefore expectations are lower and performances suffer.One argument would be for Salford to push the boat out,spend money they don't have,hope performances improve and therefore that gates improve.O.K if it comes off,but if it doesn't?
If Salford's gates increase in the new stadium,then more money will be available for better players which will in turn lead to better results leading to bigger crowds (everone wants to watch a winning team).
Anyway,that's the theory.If we get kicked out of Super League it's another matter.