Yes, update the Performer please. I think I would converge the feel of the Gen 1 Performer (aka: SSP), modern design queues from the sleek looking TRAVELER, and the clever modular table & accessories from the new SLATE. Like you're profile pic, I really like the copper color for the kettle. (I also like other vibrant colors like Spring Green, Red, Blue and the new Burnt Orange color too.)
From the SSP, I would take the all Stainless Steel table surfaces and overall robust feel. I'd keep the original Weber kettle as exposed as possible with a minimal open cart design but strong looking frame. I'd keep the GEN 4 Performer ash system, larger bail, and taller height. I'd make the charbin removable so you have option to pour the coals. I'd try to refine the gas assist nozzle design and add a gas flow control knob so could do some tasks beyond just starting charcoal... Like sometimes use gas alone (no charcoal) to boil a big pot of water for seafood boil and do a low-n-slow type cook.
From the TRAVELER, I'd use the silver radius'd thick tubing (where Traveler logo is printed) with the curved gray plastic end caps (at least on one end) as a main design element like the Traveler. I'd use the same radius'd type tubing to create the rest of the frame in a way that resembles the overall clean lines of the SSP while keeping the minimalist feel of the Traveler. I would add electronic ignition from the GEN 4 Performer on the front silver tube similar to the placement of controls on the Traveler. I'd use the gray wheels on it from the big Genesis 2 gas grill.
From the SLATE, I would borrow the interchangeable insert section on part of the table (i.e cutting boards, tool Caddy, etc), the clip on accessories (towel rack, cup holder, tool hooks, garbage bag holder, etc), and the same flip up table for added versatility. See pics below. I don't need a SLATE but I think it looks really clever and well done. (Now, I usually have my TRAVELER set up as a full griddle with two griddle plates).
Below is a pic of my TRAVELER and SSP to help you visualize the design elements I was talking about. Note: I updated my SSP with items from a GEN 4 Performer (copper colored kettle, larger lid bail, updated ash system, electric ignition, etc.).
Here are some pics of the SLATE items I was referring to.
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