The official statistics do not back up the argument that traffic on the Frances has increased. In fact, if we subtract out the very busy (and increasingly busy) Sarria - Santiago section, numbers on the Frances have steadily DECREASED every year since 2015, and are now almost exactly where there were in 2011.
Thus, after subtracting out the Sarria - Santiago pilgrims, compostelas were awarded to 93,813 pilgrims walking the Frances in 2019, vs. 104,824 in 2015 (the peak year), and 93,494 in 2011. Here's the link to the official stats:
https://oficinadelperegrino.com/en/statistics/
There is one minor excepion to the above when you get deeper into the statistics, for they do show that the very beginning is marginally more crowded than it was in 2015. Thus compostelas were awarded to 33,197 people who started in SJPDP in 2019 vs. 31,058 in 2015. However, the numbers are sharply down for starts even from Roncesvalles and Pamplona.
Overall, therefore, what the statistics over the last 5 years show is a modest increase in starts in SJPDP, a fairly steep decrease in pilgrims everywhere thereafter up to Sarria, and a huge increase between Sarria and SDC.
There is also plenty of anecdotal evidence on the forum reflecting this decrease. For example, Ivar posted something several weeks ago about how the number of pilgrims at the municipal albergue in Burgos has been steadily declining.
I know someone is going to say that compostelas don't reflect the total number of walkers, and of course that's true, but there's no reason to expect that the number of people who don't get compostelas has increased in the last 5 years. I could as easily argue the contrary, and plainly, the statistics show an overall downward trend.
So -- I'd submit that the only ones with something to worry about are the people who opened more albergues, bars, etc. on the Frances in the expectations that the crowds will continue to grow. Those same crowds only exist in SJPDP and from Sarria onwards.