There is an important rule in Islam which says that preventing harm takes precedence over bringing benefits (dar' al-mafasid mukaddam 'ala galb al-masalih)
The harm of death due to swine flu is much higher than the benefit of going to Hajj, as Hajj is an obligation once in a lifetime, if not performed this year it could be done next year
There are also clear guidance in Islam for not entering a town or country with a dangerous and contagious disease, in the Hadith of our beloved Prophet, peace be upon him
We'll have to wait and see how serious the swine flu turns out to be after the summer ends, and if it is as serious as portrayed in the media, then baning elders and children from Hajj would be a wise decision
But let's hope it's not as serious as feared
May Allah cure all those who are ill
Ameen