In fact there's another excellent candidate to kill off instead of Nuffield; Walter Christe. Get rid of him and British tanks should keep on using proper Horstman suspension and so avoid all the problems of reliability and weight capacity that came with Christie suspension.
One problem.
Christie suspension doesn't have any inherent reliability or weight capacity problems. Instead you've got a compact suspension system with plenty of travel, that is well suited to pretty much anything, and provides a lower profile than Torsion-bars.
If you're worried about rough terrain, or traveling over normal terrain at speed but still want a decently low profile, and low center of gravity, Christie suspension is by far the best option until you've got Hydropneumatic systems later on, and you can still easily adapt that to the Christie geometry.
As for weight limits? Christie suspension works just fine on the T-34 and Merkava. Which is of course the heaviest MBT currently in service by ~2000kg, and the fastest off road.
EDIT:IMO, the best way to go is Rehabilitating Fuller and Liddell Hart, and keeping Fuller the fuck away from Mosley, so a POD pre-1933, then offing Nuffield in an accident, and getting Fuller in a "harmless" desk job in the War Office overseeing the development and acquisition of tanks.