The thing is, it's not as simplistic as people wish for. It's unlikely this will all blow over in a matter of days just as it's unlikely that all hell will break out (Katla, Hekla) tomorrow. More likely that the volcanic activity will persist for weeks, months, maybe years in an inconsistent manner. Add weather patterns to that mix, then add economic pressures and hard to quantify scientific findings on the potential damage and bureaucratic rules and there's no way to predict the impact on individual travel plans. I'd say if anyone is unwilling or unable to stay at their current location then they should explore all options even if it means cumbersome and lengthy rerouting.

I find it curious that official statements identify specific damage to military aircraft engines, but nobody is demanding proof from the airlines that their aircraft have not sustained any damage at all and what their test flight specifics were.

I found a nice article on the possible problems that could pop up now from past experience: http://www.nbc26.com/Global/story.asp?S=12343581