As long as EFL don't raise a formal complaint, I can't see how CCFC can force Wasps to do anything about the pitch. Unless of course they decide to spend some of their own money.
One challenge with relaying a pitch or even just letting it recover in the off season is Wasps need the income from other events - for example the commonwealth games 7s this summer and large concerts such as Killers/MSP. So if CCFC really want a top quality pitch they need to pay for it to be laid and pay Wasps NOT to use it for other events. Or they could build their own stadium ... but I'm not holding my breath for that one.