probably injury is most likely
He’s been at Spurs since he was 16, they’re knocking on the door right at the top, breaking club records, soon moving into a brand new Stadium, seem to have a great club spirit, plenty of team mates around him in the England squad too - it’s a golden time there
form? can’t see too much of a drop off, He seems to rely more on his reading of the game & deadly eye for goal than pace or strength (which tend to drop off more severely). If anything, his form is more likely to improve over the next 3/4 seasons as he peaks physically around 27
of course, recurring small injuries can have a big effect on form & he’s played a fair few games at different levels since his teens so…
but If anything is gonna get in his way re: Shearer’s record it’ll most likely be 6 months out with a metatarsal or a cruciate he picks up in an England friendly against Malta or Jamaica or something stupid