I don't see it happening, his goalscoring is taking a hit currently. I think Messi will have a much better season stats wise and I don't see Madrid doing a league CL double, the Confederations cup could be his chance though.
Messi has to win the CL for Barca to win it next year and even then Ronaldo winning the Confederations and top scoring (loads of goals against New Zealand) would swing it combined with a league title.
It's hard to see Barca winning the CL without a Real Madrid type draw.