As far as we can tell from the MVP blogs this new SharePoint Framework is bound to tooling like TypeScript and React and won't make it any easier because traditional .Net developers have to learn new ways, and traditional Front-End developers are not up to speed with TypeScript (or even React)
Are there any estimates on how much extra learning time needs to be forecasted in the budgets?
I have experience with Lotus Domino upgrades, not with SharePoint, for every new version we roughly budgetted 20% extra learning time.
I know this is not a strict Development question. Is there any info for SharePoint Projectmanagement?