Even though it's a quick and simple ending that could, in theory, be expended, it ends properly by avoiding too much stalling and/or power leveling. Kaiju #9 and the source kaiju got defeated at great costs. The only possible thing that could follow story-wise would be cleaning up weak kaiju, having some new stronger kaiju that would erase countries (which would make anything way out of proportions), repeat of #9 such as it escaping or something or expending on the socio-polotical aspect of my intelligent kaiju who aren't evil in nature (as we know some has lived for long time ourside of humanity reach)
Even though it's a quick and simple ending that could, in theory, be expended, it ends properly by avoiding too much stalling and/or power leveling. Kaiju #9 and the source kaiju got defeated at great costs. The only possible thing that could follow story-wise would be cleaning up weak kaiju, having some new stronger kaiju that would erase countries (which would make anything way out of proportions), repeat of #9 such as it escaping or something or expending on the socio-polotical aspect of my intelligent kaiju who aren't evil in nature (as we know some has lived for long time ourside of humanity reach)