I don't read the Norwegian online papers so much now (& half of it is those annoying "+" articles that you need a sub for), to keep up with all that's going on, but are RBK/Molde just looking for a smaller league (say 14, and 26 games), or anything similar to here or Denmark? You'll know that the start of their season is always a squeeze, with CL/EL qualifiers, and at the end of season they're in the midst of the CL or Europa group stages.
All the time I lived in Norway, I thought their pyramid structure was a perfect fit for Scotland....with 3rd ties the top of the regionalised pyramid. The distances are vast up/down Norway, and across the southern third, and their flexible way of adapting the regional boundaries when it comes to the division of relegated clubs would present us with no real issues (just the egos of a few club chairmen). The Norwegian Cup (NM) is also regionalised for the first few rounds, and I was happy to see this reintroduced to our LC, which is largely played midweek, which can seriously disadvantage part-time clubs if they have to travel big distances. I think the SC should remain 'totally open', as it's played on weekends, and I think we're finally ditching replays, so the 'romance of the cup' giant-killers will still have their chance of a big away gate, or a shock win.
Kristiansund are a great example of the positive way this pyramid can work....two tiny 5th tier clubs in a city of just 25,000 merge, take less than 10 years to get to the top tier, fill their 4,000 seat ground every week, and achieve 5th place in their 2nd season up.
Re part/full-time, I kind of agree, though it seems 'nature' has sorted this out for us, with only the occasional wee part-time club earning a run in the championship & usually going back down again. I think, though, it's good to not have any 'rules' to bar clubs from promotion.