They are happy to do it next; they are not done explaining things to the current set of Valar but they could probably leave someone that job and send everyone else on to an Arda in more need. There should be a discussion about forking-and-reaching every single space Arda prior to the pardon of Melkor; logistically it will be bit difficult, since there are millions of them, and they don't really like forking off alt consent, but it should probably get consideration nonetheless.
In Ardas after Melkor has been pardoned it will take a Years-long war to imprison him again without breaking any continents. They are thinking about how to improve on that and they think they could get it down to two Years, but they'd need some extraordinarily powerful new form of magic to expect to do it overnight.