there are plenty of ways to store picture files online, or tape or disk. gmail promises to never delete anything, right? email them to yourself.
but those files are only useful if there are applications that can use them. chances are that common data formats of today like jpg will be around for a long time, but there's no telling what direction technology will go in the future. have you tried to open a microsoft word 1 document lately? who can count how many dead file formats are out there. whatever format your pics are in today, chances are that 30 years down the road it'll have been replace by something newer and better, and if you didn't convert all those pics from the old format to the new one when you could then having the obsolete binary files won't matter.
though maybe your pocket hal 9000 will convert them for you if you ask it nicely.
maybe some formats have become "too big to fail" by now - mp3, jpg, pdf - but i still store all my "absolutely can't lose" stuff in ascii text or printed on paper and stuffed in a drawer.
fifty years from now what's going to be your great grandchildren's equivalent of finding a stack of old photos in the attic?