I think that the water cooled motor will start out as an option for a few years. As for the converting your sealed motor, It should be an add-on that could be used on current motors. Hank Scott has them on his cite and they have been using them for a year or so in Thunder roadster / Thunder Cup cars.
The big thing will be cost, I saw a $1500 for the jugs and then who knows how much for rad. and pump. That will make a new motor cost around 7 grand!!! Plus rad, pump, hoses, and brackets. I hope it last for…..MMMMMMMM……5 years at that cost..lol