It all depends on what other clubs are interested. If let's say Bayern are interested on him, he won't wait for us, but if only second tier teams are interested (on lower wages than Spurs offer), he will either wait a year or sign Spurs contract.Well that's up to him - we have Sanchez who will be playing ahead of him this season anyway so if he wants to waste a year of his career at the age he is and hope that clubs will still be interested next summer then that's fair enough. Now is the best chance he has at getting a big contract elsewhere - waiting a season with little football inbetween is taking a huge risk. He wants one big final contract to see out his career.
This game doesn't work always well for clubs as BVB saw with Lewandovski or Arsenal with Sanchez. At times it works (United with DDG). Anyway, Alder won't be put of contract next summer so he isn't at rush of signing a new contract (being without a contract isn't healthy as Valdez can prove).
Of course, it is all speculation. I think that we'll sign him without giving Martial to you, but I might be well wrong on this. Neither of us has any idea what is really going on Levy's and Woody's head.