He only turned 21 last month, but yes he does have bags of potential.
At Spurs he reportedly had "lifestyle" problems, though IMO he's not yet been given a much of a chance under Harry. This is perhaps because of the reported problems, but maybe he'll outgrow these with age.
I'm unsure as to whether he'll be sold - with a price bumped up on the back of (hopefully) continued impressive WC performances - or brought back from his loan spell and given a 2nd chance. I'm equally unsure as to whether he can fit within the Spurs (or Prem) style of play or whether he's willing to compete for a starting spot against Modric, Kranjcar, Lennon, Bale etc