Outside of us on this forum, who receive updates from p/a whenever the new episode date is announced, who knows when "Jessie" will be on.
I'm sure that's a huge part of it.
Wizards was big enough and consistent enough when Jessie was starting up that it helped people remember to watch either or both shows. But with Jessie's more sporadic showings, and lack of a strong paired show, I do think a lot of interested people simply don't know or remember when to watch.
and this is a huge part of it all tv.
Unless you are "in the know" on when new episodes air(I check the listings everyday) you won't know when to tune in.
That is why the "next week:..." promos that air directly afterward are IMPORTANT!
Otherwise the common viewer would not know when a new episode will air. Jessie runs its promos after its new episodes as does every show show on tv. But I would agree that its sporadic new ep airing are not helping.
In most cases when a network extends the show's season run as long as possible, it is a good thing. Because they are trying to "milk" as much as possible from the show for the season. But this si not really working in Jessie's case and it's not helping when the target demo is 10yr olds who are not going to remember.
All that is needed to save Jessie and make it the HIT it can be, is stabilizing the night and "pimping up" Jessie to become the next big HIT.