It seems like basic boat technology has been the same for several decades.
I would like to see the following:
1. a removable battery pack that I can take into my hotel room to recharge. It would be so much easier than trying to find a hotel that has outside outlets. The batteries would pop in and out just like with cordless tools.
2. thrusters built into the hull so that we wouldn't need trolling motors any longer. Someone would have to figure out how to keep them from getting fouled from weeds, etc.
3. Sonar units that can recess into their mounts just like home tvs that retract into a hidden cabinet. It would be great for theft prevention or running in big waves. We wouldn't need unused units protruding from the deck. Just pop up the unit or units that you need.
I have a bunch more ideas all along these lines.