My own opinion is that we've achieved all we're likely to achieve, and that hanging around is not likely to accomplish more. The issue now is not achieving military dominance, which the government has and has achieved before, but to follow that up with meaningful effort to change the style of governance. This, honestly, is not likely to happen: the political will is simply not there, and the US can't make it be there. No point in staying there and being seen as an accessory to the return of business as usual.
I wouldn't expect too much of the current President, especially where Mindanao is concerned (or for that matter anywhere). I don't think he's personally corrupt, but he also hasn't the commitment or force of character to drive real change (which requires more than just challenging corruption).
Historical side note: while Magsaysay effectively marketed the idea of reform, he also failed to push the agenda to completion, and actually produced very little change at ground level... one reason why the Huk rebellion subsequently re-emerged as the NPA.
The Philippine government has on several occasions achieved transient "victory" in its various COIN campaigns, but has never cemented that "victory" by following it up with real reform. The reason, in a nutshell, is that the local/regional elites refuse to surrender their traditional prerogatives, which are fundamentally incompatible with real progress.
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