Responsive design and Web Assist fundamental
Without being condescending, I think this should be obvious already. I think it sounds strange that at all have to "wish" this of your customers, WebAssist!
We live in a development that certainly goes quickly, but you need to be up-to-date.
Google has for example new conditions, says the web pages that are responsive will show up higher on the search pages.
Responsive design should according to me - be built-in already in the first version. Then you would have had even more customers today.