Interesting ariticle.
"On average, each tourist was in Compostela 1.7 days compared to 1.6 last year. Even so, Santiago is still very far from the national average, which reaches 2.9 days"
Perhaps when it comes to Pilgrims who have walked/cycled/ridden to Santiago rather than other types of visitors, therein lies the challenge. For many the "journey" was the destination. Their time in Santiago may only be a brief stay before going home, to go to mass, the Pilgrim's office, and rest a night before going home.
I usually stay in Santiago a day, but don't really like to linger longer. It can start to become a sad place in a way as you watch other Pilgrims arriving. It's like an emotional roller coaster with a 24 hour cycle. Joy and relief, celebration, and then thinking of home.......
For Pilgrims at least, maybe trying to keep them In Santiago longer is rather like standing up at a Wedding Reception and inviting the guests to come back again tomorrow