Don't forget that La Liga is a less demanding league than the Premier League and he'll be playing for a team that expects to have most of the possession and to win 90% of their league games by multiple goals.I think Eriksen is a quality player but I dont think he is Real Madrid quality and I think he could quite easily become a bench warmer there. With Modric I never had a doubt but Eriksen just doesnt have that level of consistency, however Id love him to stay.
Bale has been ravaged by injury and is seemingly disliked by the Real fans for underperforming, but his goal and assist tally would be incredibly impressive by most teams' standards. So imagine what kind of output they could get out of a perpetually fit Eriksen.