4-2-3-1 is what I'd like to see him try too.
Messi plays centrally and without the ball it's the same Lucho's 4-4-2 scheme with Rakitic as pure RM. We need some new ideas.
Yup, I think at one point he'll have to try the 4-2-3-1, I think a pair of Busquets and Roberto can work with Roberto bombing forward like Valvarde said he likes to do.
Or we can try a 4-4-2 with Paco/Neymar (if he stays and I hope not) and Suarez and Messi behind them. However, we have to give out credit where credit due, from watching our three matches I feel like we are improving ste by step and he's introducing his ideas such as new corner and freekick tactics (That one instance when Neymar lobbed the ball to Suarez which took RM players off guard), another point is the pressing, Barca players were pressing Real players high up the pitch which made Varane and Ramos commit mistakes (when Navas saved Messi shot).
So, it's clear Valvarde is stamping some of his ideas on the team, It's just a matter of time.