A few other things to consider:
Without any prominent experts on the Juyo panel, a modern Juyo certification may be seen as less prestigious than e.g. a Tanobe-sensei sayagaki
Reduced number of swords passing does not necessarily mean that standards have gotten higher; in fact I have spoken with more than one person who feels that the last couple of sessions' worth of Juyo blades have been a decidedly mixed bag, with some swords among them that, and I quote, "should not even have gotten TH, let alone Juyo." I personally do not share that opinion but admittedly I do not collect at as high a level as they do, and thus my standards are probably lower
Reading some of the recent Juyo and TokuJu setsumei, one can definitely sense a shift in certain long-held assumptions/assertions. For example, the decision to finally certify a Chogi tanto with a date 10 years older than the previous oldest acknowledged work, and noting in the setsumei for a TJ Shizu blade that the blade is attributed to the Shizu group, of which Kaneuji was the foremost, whereas previously an attribution of Shizu meant Kaneuji himself, with a slight plus or minus of confidence
From my understanding there has definitely been an attempt to broaden the gap between Hozon and Tokubetsu Hozon of late. The number of older blades being approved, and the tightening guidelines for qualifying for TH, may also be related to the fact that we are now approaching a period in which works by some of the early gendai smiths are posthumous candidates for TH, and someday even Juyo
The increasing availability of documentation on a given blade's history — the Wayback Machine, forum and Reddit threads, as well as the tireless work of big data gatherers and analysts — now means that it's easier than ever to determine whether a blade a) has been submitted multiple times for Juyo, b) has been passed around from seller to seller, and/or c) does not quite measure up to other Juyo specimens from that school or maker, meaning blades that are good enough to be considered Juyo candidates but not good enough to actually pass Juyo are now likely to be submitted less often (as an aside: I wonder what the record is for "number of Juyo attempts by a single blade")