On Switch I have paid €30/€40 for physical versions of games that were available for €20/€30 in digital form. Percentage-wise, that's bigger than paying €80 for a €70 game, so consequently this isn't going to change my buying habits.
It's also worth keeping in mind that the physical pricing is not as static as the digital pricing, so it's not a given that physical versions will cost €10 more.
Legend11 correctly predicted that GTA IV will outsell Super Smash Bros. Brawl. I was wrong.







