I'd say go for it. Two main reasons:
1) you don't know what the future holds and having a card up your sleeve is never a bad thing. What I mean is flying in the US, adding ratings and possibly going down the IR FAA-EASA conversion route.
2) much easier and quicker (and cheaper) to validate in far-flung places. The FAA turn inquiries from foreign CAAs around in 2-3 days for free, the UK CAA typically takes 10 workings days and charges you various fees.
You could of course argue for the 'based-on' license to fly in the US, but as others have pointed out repeatedly here, this is a house of cards.
In any case, all the best, you're just about to learn the greatest thing you can do - fly!