This may be true but it doesn't mean it equals a majority. I've seen a number of folks go with older model phones or simpler phones that even though they've got a data plan it's not a fast connection
To the main question I do think it could be possible for Tapas to increase the maximum width or the file limit but it depends on what works well both for mobile and desktop devices, not to mention the load on Tapas' servers since that's all gotta filter through somewhere for storage.