Why would it be a drop? Depending how you want to build a team, you can have a 4.00-4.50 at No7 & it doesn't have to be a Brit. The Premiership should be the pinnacle of British Speedway, not a fast track for the bang average.
If young Brits want to reach the top, try averaging 7+ at Championship level first. Rising Stars in the Premiership has been a failure.
Don't forget the 25% given to the RS's, if all got re-employed in 2027, it would be an increased to team strength, not a decrease.