I appreciate that we are all passionate for our club to start the climb up the leagues, but as I previously stated this club needs to have developed an effective "System". All successful sporting structure develop mature systems and this takes years. MR inherited a very weak infrastructure, he has had to make compromises about where he's placed resources, as there were so many weaknesses [i.e. scouting system] that not all the areas could be addressed immediately. Obviously, he has tried to sort the scouting and recruitment first, so he could develop a competitive first team.
There are still obvious gaps in the system and this is reflected in the all areas of the clubs operation, however, given the state of the club he inherited he's made significant gains in addressing some of the key areas.
To change again will mean someone new starting to develop "their system" and directing resources to undoing the systems that MR is developing. This will mean less resource to the first team.
In short, give this man the time to allow the development to mature.