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Current versions of Photoshop (my version is very old) have a lot of new AI-assisted filters. There may very well be a button called "Remove Logos But Keep it Looking Natural", which will get you very far toward your goal. I don't have (or want) those and I'm not very familiar with what's new in Photoshop. That said, here are some thoughts for doing things more manually.

I think that if you tried something like the Clone Stamp over each individual logo, it would be a tedious nightmare and you'd have a very hard time matching all the tonal variations in the blue wall. Instead, my approach would be to make a careful selection of the two people (including Shatner's chair), isolate them on their own layer, and then rebuild a new blue wall below them.

• Select the two men and put them on their own layer. This will be the top layer. Ignore their cast shadows for now.
• On a new layer below that, sample the dark blue at the bottom of the wall and make that the foreground color. Then sample the lighter blue at the top and make that the background color. Use the gradient tool to drag-out a dark-to-light gradient from bottom to top.
• A gradient by itself is too perfect and fake-looking. Above the gradient layer, create two Levels adjustment layers: one that slightly darkens the midtones and one that slightly lightens the midtones. Fill the mask of both Levels layers entirely with black.
• First, use Levels to darken the areas between the legs of each man because those are in deep shadow.
• You now want to simulate the ambient light of the room reflecting on the wall in irregular ways. Using a very large, soft brush with the Flow set to about 5%, examine the original image and look for areas of shadow or light. For example, the upper-right corner seems darker to me, and the area between the two men—at about shoulder height—seems a bit lighter. Look for things like that and—using your Levels adjustments—create some ambient imperfections to the gradient.
• I don't see much texture in this particular wall, but there are many ways to introduce texture. One way is to use the same dark and light blue colors as in your gradient, and create a new layer of fibers (Filter>Render>Fibers). Change the layer blend mode to Soft Light and lower the opacity down to maybe 20%, so that the fiber streaks are just barely perceptible.
• This particular wall is designed to be a photo backdrop, so by definition it is supposed to be fairly evenly lit and very boring. Optionally, you can introduce stains, grain, grunge effects... there are endless choices for background textures to liven things up.
• Lastly, go back to the two men and add a drop shadow layer style. Use the original image as a guide for the light direction, size and intensity of the shadow.

Here's what I get after doing all that. (Note, I made a very sloppy selection of the two men.)

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