I really liked the ending of CoM for the same reasons I love the ending of the original version of The Italian Job film. Surely what happens next is left to your imagination, if you want to let rincewind continue falling and ultimately die you can, but if you want something magical to happen, likewise you can! Before I read LF I imagined the luggage swallowing him and swimming up the rimfall or something (I knew he survived because I read the books out of sequence)