I recently read a terrific review of the Shiskine Golf and Tennis Club located on the island of Arran in Scotland.
It's an old seaside links made up of quirky holes. While I have never been there, the course looks terrific . It maximises the acreage available, and all in all produces a fun test.
IMO, golf today takes too long and people are either not taking it up or giving it up so as to work more, family commitments etc. In Australia, houses prices are higher than ever before and many families see mum and dad working full-time jobs. Consequently, mum or dad heading off to the golf course on the weekend for 5+ hours is no longer commonplace .
I think more people would be interested in taking up the game if it was quicker to play. For those that love it or have the time, they'll likely play 12 holes and then an extra six.
Existing golf clubs could learn a thing or two from courses like Shiskine. Creative re-routes might allow players to play 10, 11, 12 holes etc. in 3 hours and get home. This in turn might see more golfers remain or even take up membership.