WI A possible Senate restoration in 68 AD?

In the spring of 68, Galba was informed of Nero's intention to put him to death, and of the insurrection of Julius Vindex in Gaul. He was at first inclined to follow the example of Vindex, but the defeat and death of the latter renewed his hesitation. The news that Nymphidius Sabinus, the Praefectus Praetorio, had given him his favour revived Galba's spirits. Until now, he had only dared to call himself the Legate of the Senate and Roman people; after Nero's suicide, he assumed the title of Caesar, and marched straight for Rome...
WI Galba had remained Senate's champion and restored some of the old Senatorial powers?
How is this altering History? Any thoughts?
 
In the spring of 68, Galba was informed of Nero's intention to put him to death, and of the insurrection of Julius Vindex in Gaul. He was at first inclined to follow the example of Vindex, but the defeat and death of the latter renewed his hesitation. The news that Nymphidius Sabinus, the Praefectus Praetorio, had given him his favour revived Galba's spirits. Until now, he had only dared to call himself the Legate of the Senate and Roman people; after Nero's suicide, he assumed the title of Caesar, and marched straight for Rome...
WI Galba had remained Senate's champion and restored some of the old Senatorial powers?
Why would he do that? There was very little cry for a restoration of the Republic by this point. The last serious attempt had been after the murder of Caligula, and that floundered as much due to inability of the Senators to agree to anything as due to the military's support of Claudius. Rather than make any serious restoration attempts, the Senate squabbled over which of their number should assume the title of Augustus. Once the genie was out of the bottle, it wasn't going to go back in.

And that's assuming, of course, that the army was going to sit back and settle for that state of affairs to begin with. The existence of the Praetorians relied upon the existence of an emperor. I find it doubtful that Sabinus would have looked twice at Galba if he seriously believed that that Galba was going to abolish the Principate, as that'd leave him out of a job.

Putting all that aside, though, I expect things would eventually look much the same as they did OTL. Galba wasn't a massive hit as an emperor, after all, largely because he quickly lost the favor of the military. That problem is only going to be exacerbated if he decides to overhaul the government: the Principate was essentially a military dictatorship with a thin veneer of constitutional monarchy laid on top. As such, it was fairly popular with the empire's soldiers. The support of the Senate wasn't going to mean much if he didn't have the majority of the army behind him. In short, he gets ousted pretty quickly and someone else (possibly Otho, possibly someone else entirely) gets declared emperor.
 
Maybe Galba disbands Praetorian Guard creates a "Senatorial" Guard...
He could have become the Senior Consul and reserve the position of junior Consul for a Senator appointed by the Senate...
 
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