PeteAtoms
FormulaRandom
There'll be a mod to fix it if they do occur too often.
As well as one to make them spawn constantly probably.
You make it sound like they're going to be Skyrim's version of the cliffracers

I agree though, that the dragons ought to be avoidable in some way. I don't want to be forced into a confrontation simply because I'm off RP'ing a hunter and not doing an main quests.