I can almost buy it. Looking at how none of the new series use sequel trilogy elements or characters and how Mando has avoided it so far, it is very possible that the Veil was written in to provide a plot device to erase the sequels - we may see it on Mando with Ashoka and Grogu using the Veil to undo Palpatine using it to escape his death in RotJ.
yes.. or even further back in time
i think what a lot of ppl do not understand, and what i am pretty sure of, is that the Veil/world between worlds will only take a user to an event that involved force users. its like a visual encyclopedia of all events where force users were involved in major events, force users who were, at the time, having full knowledge they were force users
so, Grogu-- or whoever may show up, Ezra especially since he has used the Veil before-- could go all the way back to the point where Palpatine used dark side manipulation to impregnate Shmi = NO SKYWALKERS EVER!!!
most likely though, IF they did tis, they would go to an event where we are all familiar. something from the OT like maybe the Obi Wan Vader fight. they could yank Kenobi out of the fight as Ezra did to Ahsoka, something Vader would remember
but we would need to have a hard date on when exactly Palpatine's son came along. He needs to be stopped from existing or stop palpatine before he exists to short circuit Palp's plans with Rey. Or, kill Palpatine before he starts his self cloning processes probably on kamino about 10 yrs before ep4
HOWEVER i think if they spent too much time and diverted the plot of Mando to this activity (of erasing the new trilogy) fans would begin to lose interest as the new, and mostly hated new trilogy steps into their lives again