I am a member of FICS, the Fraternidad Internacional del
Camino de Santiago. We are working with regional governments to deal with the pilgrim aspects of the Coronavirus lockdown.
As of today, pilgrims out walking or biking on the Caminos will be stopped and asked what their plans are. They can find a place to settle in for the next two weeks -- Many hostels officially closed are still housing pilgrims who've decided to hole up, phone them up from your guidebook. Lee Tolman's albergue in Vilares de Orbigo is still open, as is Casa de Sonrisas in Fromista. If you are in Galicia, the Junta de Galicia has opened up the massive Monte de Gozo complex to house people who are truly stranded.
OR, you can ask the nice police officers now patrolling the Way to take you somewhere that you can sit down, regroup, and find a way home.
The Junta de Castilla y Leon has set up a network of "Information Posts" in towns along The Way from Burgos province to el Bierzo. Again, ask police for help, they are (supposedly) briefed on how to deal with the few pilgrims still left out there. (one of those is here at Peaceable Kingdom in Moratinos.)
Some pilgrims are changing their itineraries, hoping to continue, but walking on is not an option, even on less-traveled trails. Police will stop you. Fines are heavy for those who refuse to cooperate.
There still are hikers out on the camino. I spoke to one this morning, and it turned out he is not a pilgrim, just a guy who's run out of money and is walking home to Mansilla de las Mulas, hoping for a ride sometime today. The Camino is an ancient highway, after all!