Note that desktop-wise, Linux use has not yet risen to the point of being economical for a SketchUp port.
Operating System Marketshare (Desktop / Laptop)
But mobile or tablet platform market share is a different story …
Operating System Marketshare (Mobile)
Operating System Marketshare (Tablet)
However, the percentages are not equal. The number of consumers running desktop and laptop are much higher than that running Tablet. (This data may be available out there, but I do not have a link.)
But, what we do not know is how many or what percentage of SketchUp users would buy a tablet edition, either stand-alone or complimentary to their desktop edition license. (So we cannot say whether the user base would support such development costs.)
It is not likely that desktop licensees would get a free tablet license. Porting code to another OS is expensive, and the cost must be offset for the engineering and later ongoing maintenance. (A discount license bundle might be an option, if that makes sense to the marketeers.)
This is not the first request for tablet SketchUp, and in the other threads some people promoted the idea that paying Pro licensees should be able to use a tablet edition free because they couldn’t be using the Desktop edition at the same time.
But this puts the cost of development, deployment and maintenance upon other paying customers who have no wish or need to run on tablet or mobile.
It just turned out that there are some technologies that can “translate” desktop code to web-based platforms. This allowed easy and fast development of the SketchUp browser app, which can run on Chromebooks and Tablets if they can run a browser. It was the obvious choice to make rather than port to ChromeOS and Android and iOS.
Also, SketchUp is a desktop application that is designed for a keyboard and a 3 button mouse. To accommodate a pencil, the interfaces for the tools would need redesigning. Many tools need SHIFT and CTRL/CMD modifier keys. SU also uses the arrow keys for axis locks.
(Basically the interface would need on screen toggle buttons for these modifiers, as well as on screen context menu button and view control buttons that work in interruptor mode like the middle mouse button. Not difficult but still a departure from the normal desktop interface. A slide-out on screen numeric keypad for the value control box would also help if no keyboard were attached. Things like this would also benefit the browser-based app.)
I’d say if this FR ever happens, it be a SketchUp Mobile Lite edition with many features stripped out.