What's sad is that it won't be mentioned. Maria won't likely be mentioned other than in passing by Luis, ("I've gotta get home to Maria," etc.) if even that. The human characters' roles on the show have diminished so much since the start that they can filter through in and out without a second thought.
Did Gabi have any sort of send-off when she left the show? She was on the show for over 20 years.
The human cast members don't even have plots of their own anymore. They exist solely to teach the Muppets about whatever the day's curriculum is and that's it. Basically, any one human character's role in a street story nowadays can be played by any one of the ten human actors with little to no difference to the overall plot. Preschoolers watching form bonds with Maria and Gordon the same way they form bonds with the celebrities like Bill Hader and Adam Scott. They know they're there, but they're not there often enough to care about.
That's the other thing: I love all the human cast members, but having ten of them as well as a huge amount of Muppets for only 26 episodes (sometimes less) when so few of them play an actual role anymore? Ten is a lot of main characters for any show, much less a show where their entire story happens in 11 minutes and they also have over a dozen Muppet characters as well as countless fairytale creatures and celebrity guests to fit in, too. In the beginning of the show, four human characters held down 130 episodes. I think everyone on here expects every current human to get just as much screen time as that despite more than double the human cast members and one-fifth the number of episodes. It's just not logistically possible, and that really is too bad.
Even if every human character were to get an equal amount of main roles in street stories as each other, that would still only add up to 2-3 episodes per cast member per season. It wouldn't help the kids get to know them better at all.
The fact that former heavy-hitters like Gordon and Gina are now being relegated to being extras on the street with no focus or lines is just sad to me. They all have so much to offer. I'm surprised more of them haven't signed off from the show already, to be completely honest.