This is an idiotic debate based on false premises.
It's entirely a false dichotomy. An athlete who might run 7-90 miles a week in the winter, doing conditioning work, might very well only be running 40-50 a week in the summer during the track season itself. A "high mileage" advocate will point to the winter conditioning work and say "see! you gotta have the base." A low-mileage advocate will say "see! he only ran 50 a week AT MOST when he was racing well!"
The big picture is rarely as simple as that. If you look at an athlete's training program and ONLY look at global weekly volume, you're ignoring at least half a dozen more important things.
I also summarily reject your premise that running 70+ a week necessitates doing most of it at a jogging pace. Some of history's best milers were doing 70+ a week and running quite quick more days than not, before dropping mileage and emphasizing track work more.
El G was a ~70mi a week guy during his conditioning phases- in the schedules you can find online, he was often doing 30' runs twice a day right around 5:00/mile (so he's covering up to six miles in each session, or about 11mi/day when you get conservative estimating fractions and allowing him a few minutes to get going).
John Walker, Steve Cram, Steve Ovett, and Steve Scott (wow, guess to be a good miler should be named Steve?) would run something on the order of an hour a day for their main session and that hour would NOT be a jog. Granted, 5:20 pace for those guys isn't as fast as it'd be for you and me and Uncle Joe, but running for an hour at ~90 seconds/mile slower than your mile PR is not useless jogging by any stretch. Most of those guys doubled a few times a week, too.
It's stupid to write out a whole training program based on LIMITING one factor. It's better to do the training you require and let volume/intensity take care of itself.
It's been known for more than a half-century that a certain degree of non-specific, general conditioning ("base" "fundamental" "marathon training" whatever you want to call it) goes a long way toward good running when you do it before specific/race prep training. Does everyone need to run 1000 miles in a 10wk period like Peter Snell did? Likely not. Are you going to excel running multiple 1500m rounds in a championship when you're not running much more than 35' a day? Ehh, maybe, but I don't like those odds.
I say the focus on volume is way overrated. You see coaches touting low mileage/high mileage programs and I wonder why volume is the defining characteristic of a program. Most of history's best milers have showed us that plenty of good, hard continuous running + hills + speedwork = success.
The exact amounts of each will vary, but I have trouble believing you're going to run a very good 1500m on what, 40' of running a day- especially if you're going to be running rounds.
I'm not saying every miler must run 100 a week, but rather that if one is preparing properly and covering all bases, the volume shouldn't be a concern. It will be what it is- trying to match your volume to ideology is a fool's errand. If you're training appropriately and running 100 a week during the winter, and 40 a week during track training, and you average, counting your time off and missed training for illness/injury/work, something like 65/wk for the year, are you low mileage? High mileage? Moderate mileage? It doesn't matter. The volume question is not a be-all-end-all.