If Ferrari so much as hint at an LMP car instead of F1 next year, then I bet the rules will be changed to screw it up, the tracks that run LMS races will have chicanes added willy nilly and have other series suddenly moved to other venue, TV companies that broadcast them will suddenly have to pay a whole lot more, not just for LMS, but anything else they show that the FIA control.
While I would love the idea of an LMP ferrari (and Toyota and BMW etc), I fear the price would be very high if it comes at the expense of F1.
I will eat my house brick by brick if we don't see a ferrari on the F1 grid next year.
btw, I do expect a toyota and BMW to produce a LMP within the next 4 years, but the rulemakers need to get there act together so that one car is competitive both in Europe, Asia and the US.