The next player to break into the first team picture will be either Pritchard or Veljkovic, IMO. Maybe Ryan Fredericks, who is earning rave reviews at Middlesborough, might get a chance too. Ceballos might make an appearance or two before any of that lot since he already has the advantage of having a first team squad number. But, long term, I think the others have a better chance of earning a consistent place. Of course, there's Tom Carroll too but I get the feeling that he's just going to fall short of the level to which Spurs aspire.
Of the younger group, Onomah, Oduwa, Winks, Carter-Vickers, Walker-Peters, Ogilvie, Ball, Lesniak, Miller, Maghoma and Glover all look to have genuine potential. Not to mention Marcus Edwards, who is younger still. Obviously just potential, though at this stage. No telling which of them will continue to progress.
Given that we already have 5 academy graduates in the first team picture (Kane, Mason, Townsend, Rose, Bentaleb), plus decent players we've recently sold for good money (Caulker, Livermore), and given that every player mentioned in this post has come through the academy within the past six years, it shows that the hard work put in by John McDermott and his team over the past ten years is finally paying off.
Very encouraging.