The use space for the open source version of wine in future is almost certainly going to be the user who has a small number of windows applications which she needs to use in order to "round out" the linux/bsd desktop. I make a lot of use of wine for spotify (I couldn't do without it) and to run an old but legitimate (ie purchased) copy of Word 2000 which is still required in order to turn around amended versions of Word documents which recipients expect to receive back in perfect native format. (They provide a draft, I return a revised/corrected version.)
For that kind of use area it is extremely valuable.
Commercially, the porting service referred to sounds like a sustainable revenue stream while windows is a mainstream OS.