AHC: Successful Tetrarchy

Emperor Flavius Diocletianus introduced a new system to the Roman Empire, as a solution for the continued crisis in third century. The system, which includes multiple emperorship (Augusti), territorial divisions, and successors (Caesars) appointment, is well-known today as Tetrarchy.
IMHO the tetrarchy itself was a VERY great idea; it allowed the Romans to deal with multiple problems in multiple fronts at once, and it absorbed potential claimants of the Imperial throne into the Imperial system itself.
However, it quickly collapsed after Diocletian's abdication. So I have a question for many Roman experts in this forum, how to make the tetrarchy last longer than the OTL...?
(a few centuries, maybe...?)
 
*bump*
I personally think that Diocletian only need to reform one thing: prevent other people (including the army) to proclaim their own Augustus/Caesar. That way, Tetrarchy can last much longer than OTL.
 
How do you plan on doing that? The army's role in politics at that point is rather firmly established.

Well, that's exactly what I want to ask...
How about this, instead of "2 Augusti and 2 Caesars" it is just "4 Augusti"...?
So each Augustus choose their own successor, but all of them are still acknowledge themselves as "1 empire"...
How is that?
 
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