Actually, mainland China was the first region to be IP banned from the Japanese servers. That was long before SEA, back in 2013. I might be wrong, but I think they have not lifted the ban since, and China does not have its own version of PSO2 either.
http://www.pso-world.com/forums/show...Chinese-(1-13)
Of course, in SEA's case, they could have done it solely for the reason you mentioned - at Asiasoft's request. I just believe it's best not to be too optimistic about it considering that there is another region that has been IP banned permanently. Seeing SEA's potential shutdown as a guarantee that players from the region will be allowed back in JP may be a little too much.
We can only see how this will play out in the coming months.
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