The paper stated the decision to go maglev was solely that of the then 79 year old head of JR Central. The alternative rail proposal was far more practical in that switching time for overtakes at the intermediate stations would be much reduced and that longer-distance trains beyond Osaka could still run through at fastest possible (for rail) journey times. As it stands with maglev some Nozomi or equivalent are still going to have to be accommodated on the old line to maintain through services from the far west otherwise the disbenefits of enforced interchange risks losing market share to air from from far west just as the last stages of conventional Shinkansen construction there are starting to come to fruition.
With the maglev tech not as efficient as at first envisaged, the last thing they really want to do is to be running trains around solely carrying only fresh air which an all stations tier may be at quieter times. A skip-stop approach might be the better solution to an extent, but regions served are likely to want to build intermediate traffic between them as well as to the major city extremities.
I still think a reversion to conventional could make sense. The gradients are within rail's capabilities, and the major time savings will be from the new route not the technology switch. Slightly smaller trains might be necessary I think, but JR East has built smaller profile stock for mini-shinkansen routes.
The thing is that these SCMaglev trains can accelerate so fast that I am not convinced that anything other than an all stops stopping pattern is worth it.
Skip stopping will reduce capacity unless overtaking places are put in - which then runs into the "maglev tracks can't switch fast enough" issue, the same as regular stopping patterns.
If we assume that the four intermediate stations between Tokyo and Nagoya are at equal spacings for the sake of simplicity, that leaves us with 286km and five "jumps" - so a stop spacing of ~57km.
Since the power conversion system is built into the track, SCMaglev is limited in acceleration only by passenger comfort. So let's just set it to a tube like 1.1m/s/s (information I have found suggest the real value is higher than this).
The train will accelerate from a standing start to 505kph (140m/s) in approximately 127 seconds. Call it 130 to account for reduced 'jerk'.
The train will have traversed ~8900m in that time.
8900x2 is ~17.8km in 260 seconds, leaving ~49.2km to be traversed at maximum speed. That maximum speed segment would be around 350 seconds, giving us ~610 seconds or so.
Make it up to 11 minutes for the dwell time, which won't be that long on such a short journey, and you would reach Nagoya in ~54-55 minutes.
This is substantially longer than the claimed ~40 minutes, but still utterly
crushes the best the Nozomi can do.
The Nozomi seems to take around ~85-90 minutes today. A single seat ride might be attractive, but is it half an hour longer attractive, given that a Chuo Shinkansen operated in such a manner would be capable of a turn-up-and-go frequency?