Trinnov has been hinting at improved bass management and modal correction for years now, always saying they would not change from their current scheme unless they could do substantially better, but that they were working on "something" in the back room. Be very interesting to see what they release.
On the measurement diversion: defining steady-state is of course a function of room size and listener position, but for most homes it is not an issue and the room correction folk (and others like REW) use sweeps proven to work in the real world. The times I have run into problems were in the past when I was helping acoustic designers for larger spaces, like our church, where the direct and reflected paths as well as reverb times were long enough to require longer dwell time in the frequency sweeps. The last time I did anything like that, I was using a fancy professional analysis package (whose name I have forgotten, sorry, it was not mine), and it had a neat mode that set the dwell time based upon room dimensions, RT60 (etc.) values it measured, and frequency. Longer dwell at 20 Hz, shorter at 20 kHz. I had (have, technically, but replaced by REW now) a "lower-end" analysis program costing only a few thousand dollars that starting each sweep with an "impulse" to help determine time delays and could also tell you if you needed to use a longer sweep for steady-state analysis (it did not do it automagically).