Yes Pedro, Reactive is the future!
But the differences between Traditional Web and Reactive are big enough to lead me to think that a conversion made automatically would broke a lot of things which, in turn, required some man power to fix, that is problem for the companies in terms of time and money and the result would probably be the rejection to upgrade the platform version and a pressure on OutSystems to maintain the support to older versions.
So I think we will have to maintain some Traditional Web apps for a while. Be brave Pedro