The best replacement for scalextric is carrera.

The best alternatives to scalextric are rated as following:
★★★★★  carrera
★★★★  scx
★★★  ninco
★★  afx
★  carrera digital
★  carrera go
★  scx digital
★  carrera slot cars
★  carrera cars
  hornby
  hotwheels
  slot cars
  slot.it
  micro scalextric

Your alternative for scalextric is not listed? Suggest!
Speaking about scalextric, one probably shouldn't forget about scx.

Other search terms related to scalextric and their ratings are:
★★★★★ scx
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Google Trends

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scalextric
carrera
scx