That is something the sport will never solve; when the championship is decided/ or can't be won, many drivers won't enter the remaining rounds. Many years ago I thought we'd eventually see entries for the whole season; as you see in the WRC, or top line racing series; like the BTCC for example.
As we've said countless times, most UK competitors only want to do a one day 45 mile event. There aren't many who want to do more than that......