Well if they're serious about pushing DD they'll have to start making it more attractive. I expect retail price matching and sales on both consoles tbh.
I've responded to you as to why that is not a very attractive prospect based on previous implementations of digital pricing where I live.
JUST BUY ALL YOUR GAMES DIGITALLY FFS
Before the change, it didn't matter - I could choose either form (whichever was cheapest obv) and still reap the benefit of not being bound to a disc. Now I have to buy digital to get that same benefite but it will likely cost €10+ more than the games at retail.
Is that clear enough for you?