Maybe, but the interchange argument holds water, I feel. You can't accurately gauge that one however as there are no current platforms to measure usage of, but having to change to LO or the Bakerloo at H&W to get to Clapham when the Southern service isn't running is a _painful_ crawl.Agreed - Willesden has improved a bit from the days on a late turn , when the premises I went to get some junk food from (no Waitrose then) , had a shotgun raid on it which I missed by about 20 mins ! - the local travel needs are well served by urban services and there are no obvious flows from further out.
Additionally, once OOC is open Willesden-OOC for the GWML avoiding Paddington would be attractive, if OOC manages to hold on to the proposed Victoria Road LO station (which I think have now been descoped?). Not sure heading south for HS2 will be attractive along the WCML, but if it ends up that way, OOC could be attractive for relieving load on Euston, even more so if they can build the surrounding area up as they have at Stratford.