Someday chartplotter manufacturers will figure out that a wireless mouse (or other pointing device) will be a plus.
I just took two Garmin design engineers out in my trawler for 3 days. They're the ones designing the next generation chartplotters. There was a lot of discussion about the use of touch screens in rougher weather and the user-interfaces necessary to make them work better at tough times (when you really need everything to work well).
On our last day, we headed offshore Panama City, FL by just 3-5 miles. It was a 3-5 foot weather day with a nasty, choppy, 4-5 second period waves. It's the typical day when you wouldn't go offshore but we actually were waiting for these conditions to head out.
It wasn't bad at all in following seas but when we headed directly into the waves squarely, it created a difficult and uncomfortable motion. That was when we tried a variety of touch tasks to see what it was really like. I'd been there before and I knew - but the engineers hadn't.
The end consensus was that touch is a great way of using a chartplotter. In very rough conditions, it's better to put your palm against the bezel of the display but most of the time, that wasn't needed. Even dragging items around a screen was tried, all with great success. It has to be said that there are certain touch actions that are easier than others (long presses need to be out of any chartplotter).
I'm not convinced that a mouse would do as well. The direct visual feedback of your finger touching something and reacting makes a big difference. I think a trackball could give good results too but all common remote pointing devices require moving a cursor whereas your finger can instantly move to the area of interest instantly.
I think touch is here to stay.