Plausibility Check: Ivan V of Russia, of the House of Rurik?

So in my TL All Hail Germania, I've been toying with the idea of Ivan IV not accidentally killing his son, and Ivan Ivanovich eventually assuming the throne. Apparently he was just as bat shit crazy as his father. First off it this feasible and second any thoughts on how this might affect history. Just for reference, my knowledge of Russia history goes about as far as the History Channel's Russia: Land of the Tsars and what I learned in AP Euro.
 
My impression of Ivan the Terrible is that he wasn't so much crazy as utterly ruthless.

IIRC the Muscovite Princes were just uniting the Russian principalities into one state at this time, so I'd guess that the major question facing Ivan V would be which direction to go in. East is full of nomads, steppe tribes and other annoyances of both pagan and muslim origin and varying degrees of civilisation. West is Lithuania and in fairly short order Poland-Lithuania, which is a bit of a tough ask - although there were quite a few Russians and similar within the nebulous borders of the Grand Duchy. South is the remnants of the Golden Horde and the Crimeans Khanate, which is supported by the Ottomans. North is Sweden.

I'd expect some aggression towards at least one of these, and quite possibly some thoroughly vicious internal politics. The major questions of the reign will be who does he marry and does he have a son.
 
Well let us assume that Ivan IV has a moment of clarity and doesn't strike his son's third wife, which IOTL sent in motion the event for both the death of the grandson she carried and then Ivan IV accidentally killing Ivan Ivanovich with his scepter.
 
Well let us assume that Ivan IV has a moment of clarity and doesn't strike his son's third wife, which IOTL sent in motion the event for both the death of the grandson she carried and then Ivan IV accidentally killing Ivan Ivanovich with his scepter.

I remember discussing this possibility with Midgard, and he said that Ivan Ivanonich was more reactionary than Ivan V, and he could have been a disaster in the long run. Also, the famines and other agricultural problems that happened during the Time of Troubles are still likely to happen. So while you would have Russia more political stable, the Tsar would still face economical problems, the boyars would still try to preserve their rights and is likely some kind of external conflicts.
 
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