Magnepan 1.6 and 3.6 replacements?

Maybe, but I doubt they will just because they are still selling like crazy, the value on the used market is still quite high as well.

The reviewer of the recent Hi FI + review of the Eminent Technology LFT-VIIIa's mentioned that he thought the Maggie line was somewhat
outdated - with the exception of the 20.1 - the 20.1 being a push-pull design, the other models use single sided magnets. His conclusion was that yes, the Maggie designs 1.6 and 3.6 should be updated.

The ET's he pointed out use double-sided magnets like the Maggie 20.1 and the ET's are considerably less money.

I read the same article and didnot have the impression that the gist was that Maggies are "outdated" at all. I will not put down the ET LFT-VIIIa's, I have heard them and believe they are wonderful speakers, at a great price, but let's get real, they do not kill the Maggie 1.6's at all. I still do not believe that they are as seamless as the 1.6's because of the hybrid nature of the design. But, both are very good and great bargains at their prices. Finally, MG-20.1's only added magnets to the midrange panel, since the MG-20r's had magnets on the bass panels already. The difference between the two speakers is very small and not a revoltion in sound quality. My point being is that even if Magnapan added magnets in the front of the 1.6's/3.6's they would improve the sound slightly which would be good, but the present generation of the 1.6's/3.6's are far from being "outdated".