Keeping in mind that I should “walk away if the numbers don’t work” and that “There will always be another deal around the corner” will prevent me from becoming too anxious to make a purchase.

It's not what you say, it's how you say it".THAT is what prompts legislation to prevent contract assignments in real estate, an otherwise perfectly normal, legal and common business practice.What Stan is talking about sounds like a hybrid between contract assignment and "back-to-back" closings.

At worst it seems to be a battle of some huge egos that is preventing something that could be a game changing, quantum leaping type of institution from ever getting off the ground.Just trying to understand what is happening here?

Not saying ya'll won't be together forever but it might prevent some fights along the way. 

Pre screening them and explaining the process might help prevent getting into a situation where they back out.

I want to reinstate the loan and use a loan servicing company to deal with collecting and disseminating payments for as long as I keep the property while trying to walk quietly to prevent the dreaded 'due on sale clause'.

It prevents local municipalities from banning short-term rentals (as some currently do).  

But I'd also add that it wouldn't prevent me from going under contract.

So what all problems can prevent me from getting a mortgage on it?

You would think common sense would have prevented some of the crazy DIY remodels but then if that were the case HGTV would not be such a blockbuster network.The root problem will determine the best route to leveling the floors.