My two cents are: Even if the MRA is contributing to some stepping down, to those that really wish to contribute by lending themselves to the Senate or Ministeral work, the 5 minutes (at the very most) needed a day to not just make the required recruitment quota in a week but surpass it, should not be a real hinderance. If you do not have 5 minutes of leasure a day which you can spend doing what basically amounts to, no matter how important, monotone repetative actions, then maybe you generally do not have the time needed to be a Senator or Minister. Even if you already planned into your already full day, say an hour, for senatorial work, and on some days that hour might be filled to the brim, on other days the work required could very possibly just fill a half hour. So you could spend that half hour doing your recruitment for the entire week.
So option number 1: If you step down solely because you do not have time to fullfill your MRA, then you either have very poor time managing skills or not enough time to do your job anyways.
Option number 2: You do have time, but you simply do not want to do the MRA and that dislike of recruitment was great enough to persuade you to give up your post. In this case you should never have accepted Office in the first place.
As to the recent cases of people stepping down, the ones I know of in depth were do to changes in circumstances that led to unforseen impasses in available time. They could not have know that they would soon lack the time and when they became aware of it did the only honorable thing. They stepped down and let someone that could spend more time take over. They put the needs of Europeia above their own political glory (flowery but accurate). And I applaud that.
As to everyone in Office currently: The MRA is a mandated minimum. More recruitment is always appreciated.
To everyone not in Office but looking to run come election time: You have no quota, but voters always like someone who shows their dedication by recruiting.
To everyone not in Office and without plans to run: Just recruit, dammit.
Edit: As always, to fix grammatical and spelling mistakes. (I suspect though more lurk unseen.)