The temporary paths will probably be in place until HS2 is in operation, perhaps 2030 or later. Once HS2 is in operation, a permanent replacement will be opened parallel to HS2, on its south side between Burton Green and Berkswell station.
Make any comments you have on the “temporary” path between Kenilworth and Hob Lane to Warwick District Council. Search for reference W/20/1978/HS2
For the “temporary” path between Hob Lane and Berkswell station, send comments to Solihull Metropolitan Borough Council. Search for reference PL/2020/02821/HS2DIS