I think, based on probability, because it is so many of them, some will survive and for Europeans/worlds there are only three spots a country can use. I don’t remember when the last time Russia or any other country had so many decent juniors coming through. In the last roughly 15 years that I have been watching junior pairs, it was always maximum 2-3 pairs coming through. And those pairs even have the jumps (most of them).
I like B/K
https://www.youtube.com/watch?v=NapaUXNSYLs Is Moskvina coaching or choreographing them, or doing both? They definitely can not go wrong with Moskvina in their corner.

Boikova has nice lines and good technical ability, but I notice she has trouble with unsteadiness on jump landings occasionally.
P/K are very good too:
https://www.youtube.com/watch?v=0cvsuKo2gPE
https://www.youtube.com/watch?v=OftHtwZriQw
M/G are talented, but I'm less impressed with them overall:
https://www.youtube.com/watch?v=Yf8A5l4i7ms
I find Panfilova/Rylov very impressive. They must be the youngest of this new crop. They seem to be like a Russian version of Sui/Han:
https://www.youtube.com/watch?v=w6NWPGypMHY The question is whether Panfilova might continue to grow taller, like what happened to the magical partnership of Davankova/Deputat. Later, the sexy partnership of Bazarova/ Deputat somehow never got off the ground. I'm not sure why. I really liked B/D and I was rooting for them.
Efimova/Korovin are a very dynamic pair:
https://www.youtube.com/watch?v=9psxo_i040s
https://www.youtube.com/watch?v=hXpcQFTE8Ok Korovin looks like a slightly taller version of Deputat
What all of these younger Russian pairs have got over T/M and Z/E is a more visibly passionate connection and an ability to project. IOW, they are not boring expressively. I can definitely see any of B/K, P/K, P/R and E/K surpassing Z/E. The thing is that all of these younger teams need more seasoning (i.e., experience and maturity).
Another interesting thing about the newer generation of Russian pairs is how much they seem to incorporate North American/ Western qualities/inspiration with their Russian aesthetic. I think that's indicative of the increasing globalization of the sport. It's also likely due to the fact that a few key North American teams and choreographers have had significant influential success in pairs, along with the very impactful German influence of Savchenko/ Szolkowy/ Steuer (more recently Savchenko/Massot). Also the French team of James/Cipres, who gained success with an American coaching team and initially a British choreographer (former ice dancer), have had an impact the last couple of seasons on the pairs discipline. In fact, it is ice dance influence that is currently revolutionizing pairs choreography. Add to the influence factor the extraordinary success of Chinese pairs (who rely heavily upon Western choreography/music combined with the unique acrobatic strengths of Chinese culture; plus their selfless devotion to aceing the basics of figure skating technique has been revolutionary).
ITA that Novoseov/Stolbova will have to meld well and really bring it in order to keep pace with or try to stay ahead of the up-and-coming young Russian teams. At this point, the N/S team is apparently still working on exploring whether they can percolate together on all cylinders.