here are the other 2 hypothesized endings to doraemon..

this one is so pessimistic ending:

da xiong is suffering from autism and that all the characters (including Doraemon) are simply fictional characters in his imagination. diaoz..

the other one is bad too:

da xiong fell and hit his head on a rock. He fell into deep coma, and eventually ended up in a semi-vegetative state. To raise money for an operation to save da xiong, Doraemon sold all his tools and devices in his pocket. However, the operation failed. Doraemon sold all his tools except for one used for the last resort. He used it to enable da xiong to go wherever he wanted, whichever time era he wished to go. In the end, the very place da xiong wanted to go is heaven... diaoz..

ok.. i think the version i shared in this blog is so much better..