you will see that the change to 4 weeks is only being considered for the upcoming hardfork because the code change is trivial and low risk

Yes, @steemitblog wrote it was easy to implement, but the reasoning for considering it is also that there was support for that idea within the community:

We are very excited about the fact that such ideas are being proposed by the community ...

What I meant with "interesting idea" is the suggestion of @theycallmedan to burn a certain percentage of the STEEM always if anybody wants to initiate such a faster power down. So if one could fulfill the necessary security requirements (or if some people - I am not one of them - by their own choice optionally could accept a somewhat higher risk in exchange for a faster power down) that could be an interesting instrument to reduce the inflation of STEEM.

Thinking the idea to burn STEEM (whenever possible) is interesting doesn't mean I was supportiing the proposal for a shorter power down period (currentIy I am not).