Frankly, I don't give a flying F about the license of my edits, as long as anyone can use them.
(I DO care about the fact that a lot of existing data from others may be removed in the future, which is by itself reason enough to consider a license change plain dumb.)
I know there was an option to grant your contributions public domain status, which I selected, but that was no more than a poll. What was missing was an option to explicitly license contributions under both new and old license.
This way, in case of an OSM fork, my new edits can still be used for both.