Predict Mario Kart 8 attach rate lifetime

[Ryng]

For what we know, for now, Mario Kart 8 is at 53.5% attach rate globally, 50% in the US (as for March 2015), 45% in Japan (withouth digital), and 85% in France...

What do you think will be the attach rate lifetime? Will increase or decrease?

I will go with 53%.