Well, somehow I think that Boeing didn't spend who knows how many millions just a couple of years ago without due consideration of expecting a nice fat return on those dollars. I expect we'll see some around for 2 more decades.
So. It seems like it's more than 15 years since we first started seeing winglets.
Time sure flies when your having fun, and aside from the technical advantages they look great especially the new Split Scimitar Winglets.