There are many fantastic ideas that aren't deployed on a wide scale for various reasons, such as losses in aftermarket service revenue.
1. User friendly timing regulation - even better if the regulation gauge was on the back but you get the idea. What will become of the overpriced Chronometer?
2. Fine ticking quartz - the smooth action of a mechanical with all the benefits of a quartz. It won't replace the appeal of mechanical watches, but it will provide a tempting substitute. The Precisionist movement has only been placed into ugly watches so far.
3. Non-degrading lubricants - this JLC Extreme Lab makes use of graphite for dry lubrication. Unlike conventional oil-based lubricants, graphite does not degrade over time. This could mean an ultra long service interval (possibly greater than the lifespan of the customer), thus depriving the manufacturer of the opportunity to gouge service money from the customer. It won't be cheap, but I hope it's possible to design a dry lubrication watch that doesn't cost $200K, this could justify a "lifetime watch" costing >$10K for an average WIS.
4. User friendly battery hatch - the picture below is actually my Casio heart rate monitor strap but the idea is transferable to watches. Just twist and open. This will allow people to use quartz watches until they die of movement failure without any watchmaker intervention. Exceptions might include gasket replacement but not many of us actually swim with our watches.
5. Scratch resistant cases/bracelets - hard materials, typically >8 on the Mohs scale can preserve the finish of a watch and negate the need for polishing or replacement of beaten up cases. Such materials include: Zirconium Oxide based ceramics, tungsten carbide, cobalt chrome, etc. ~ these are also much more corrosion resistant than stainless steel. Hard cases have mostly been limited to fashion and microbrands; with the exception of Rado as an "established" manufacturer.
6. Gold coloured ceramics - a billion times more durable than gold plating and cheaper than solid gold. It's a middle-class man's gold watch. It won't have the weight of solid gold, but what's to say you can't bog it down with tungsten?