With the mentors available to them, these young fullbacks are in the perfect place to develop into top class players. I certainly wouldn't bet against them both becoming key players for us in the future.
The transition from the established old guard to the new is always tricky, especially with these lads being as young as they are. I'd rather we took this route than say, the Newcastle route of signing old established players on big wages. Trippier is a good player now, but in a couple of years when he's in his mid thirties and still pulling north of 150k per week, I'm sure we will be glad of our young fullbacks.