So I was thinking about previous RPG games and thinking about what Bethesda said about Radiant story, and I have come up with a scenario that could be in the game. Here are my postulates:
Bethesda says that depending on what you do and if you have faced a dragon recently, that could affect where/when they spawn. They also champion the radiant story to be able to send you to different locations that you haven't been to for quest. OK please don't read the next sentence if you haven't played ME2 before.....
In, ME2 if you wait too long to go after you shipmates in the relay mission, they could end up dead.
Bethesda could punish you for being a hermit. In that if you decide to wood cut your way through life and you already know that you are the chosen one to stop the dragons, dragons could start scorching small random villages off the map each month or two of game time you wait.
This could motivate you to pursue the main quest if you have personal ties to small towns. And besides, the end of the world shouldn't wait for you to decide to get up and do something right? Anyway I think it would be a nice feature as it would introduce more unpredictability in the game. And maybe if you were really bad in the game and took so many years to tackle the problem, then there would be nothing to save..
Would anyone appreaciate main quest inactions having some negative effects?
I disagree with your conclusion.
Dragons spawning from time to time are not a punishment or penalty. They are an expected part of the fun of playing Skyrim.
There is not going to be any sort of ticking time bomb where you have to rush to do the main quest or suffer some penalty.
Rather, the game will entice you to progress in the main quest at least to some extent, because learning dragon shouts is part of the main quest. If you want to learn dragon shouts, at some point, you will have to go to the Throat of the World and the Greybeards will shout your name from the 7,000 steps, somehow activating your dragon shout power I believe.
After that, every time you kill a dragon you absorb their soul and every time you find a new word of power, you are progressing in the main quest at least in some way. There will also be some Radiant Story quests that might send you to a dungeon that turns out to contain a new word of power, for example.
/current Oblivion playthrough is a couple hundred hours and sdtill haven't touched the main quest, encountered any Oblivion gates or even visited Kvatch yet.