The impact of this is minimal for a University Student who's got a full 4 months to devote to the Army - they can do BMQ in May/June, then roll straight into a DP1 and be fully qualified in a single summer.
For a High School student, if they're only able to commit to 2 months (Jul/Aug) then in their first year, they get BMQ, then their second summer they do DP1.
Alternatively, a HS Student can do a weekend BMQ through the winter months and go onto DP1 in Jul/Aug.
What about a non-student?
If you can't run a mod 1 during the training year because of a shortage of qualified staff or other priorities, so be it. You can run every mod during the summer, regardless of when, where, or how you do so.
Requiring all courses to run a continuous 8 weeks regardless of local units' ability to support cuts brigades' ability to bring in anyone who can't fit all of that time in at once.
If the financial taps are getting turned on, focusing on running PLQs and providing additional local training days and employment for those available and interested could create capacity.
I remember doing support exercises galore and opportunities for lots of interesting short taskings across the country as a non-student reserve sig in my late 20s.
My QL/3 was more than twice as long as the DP1 I ran as a course director. There was some excellent training in the older, including weeks in the field on both my trades courses. But it was a lot more difficult to get troops in the door let alone trained with the time commitment (and explicit requirements at the time that troops had to do a summer instead of fall recruit course, plus a driver wheel before trades training). I'd never have been able to take the 24 weeks of summer training in the jobs that I had without quitting my job to do so (which I did).
The newer system reserve sigs are running are more manageable, and HRA is even more so.
If the best possible pipeline for retaining troops in a given trade from enrollment through instructor cadre is getting high school and university students, so be it. Likewise if unit instructor capacity prevents other routes from being considered in the near-term, that's fine.
But decisions like removing modularization and options for delivery entirely seem short-sighted to me.