It's summer let's kill some time.
If people were to disappear tomorrow, the feeding stopped, the water wells eventually stopped, and wildfires reshaped the land, what exotics would still be around in 100 years?
My top 5
1. Auodad
2. Axis
3. Sika
4. Red Stag/ Elk hybrid
5. Sheep hybrid
In addition Nilgai will continue in deep South Texas. Blackbuck if they can survive until fire opens up the landscape just might do very well.

Aoudad cause most fires would make it to the rock cliffs, and pigs lol cause there's so many

Definitely Aoudad
Pigs
Axis
Black Buck just because they breed like rabbits and as long a bad freeze don't get um.
I would think Fallow because they do well in alot of different climates and country.

Assuming they get out of the high fences, I think most of the species that have a breeding population would be around. Some would cross as noted above (oryx, goats and sheep). I think wolves and wild dogs would become the top predator. Hogs might decline in a grassland environment. Except for those Wart hogs. I wonder what the wild cattle would look like in 100 years.

Once wolves arrive wild dogs will disappear. Coyote populations will plunge, as they are reduced to eakking out a precarious existence, in the buffer areas between packs. I didn't mention hogs, because the word that comes to my mind is varmint, but they'll hang on around the water courses.

What's the deal with the wildfires reshaping the land? Lol

With no one to control predators the axis, sheep, ibex and blackbuck will be in trouble in most areas. Aoudad, Elk, Eland, Oryx, Gemsbok, Addaxx, Nilgai, Bison, Lechewe(if they can get to lowland wetland areas) and a few of the exotic deer species will probably make it. Biggest issue with some exotics will be weather and internal parasites.

Before the land was settled, cedar was confined to deep canyons with most of the Edwards Plateau grassland or oak savanna, regular fires controlled the cedar. Think back to the fires a few years ago, How much of the Edwards Plateau would have burned up if they weren't controlled?, those fires would have gone a long ways.

Axis aoudad Nilgai elk.