I think these players trying to follow Murray might be disappointed, Murray's improvements has largely been a result of larger strength and better serve
Murray was reaching finals, beating the top players and sucking on clay even before Lendl.
I'm not saying Lendl didn't help, he surely did but he did not changed much if any in gameplan or technique. Murray is basically the same the same player for quite some years now. I think it's not an exaggeration to say that pre Lendl Murray would have had quite a good chance to beat Janowicz, Verdasco, Djokovic at Wimbledon and Berdych, Djokovic at a windy US Open.