I'd be really surprised if Arcade has a short shelf life. I'm sold on attribute rules and without Arcade, they don't happen.
ArcMap and ArcCatalog have one foot in the grave, there's just no denying it.
By the end of this week, all this stuff will be in my rear-view mirror, but I've had a ton of fun with Unix Scripts, AML, PERL, VB, VBA, Python, and Arcade over the years in various flavors of ESRI-Arc* products. You may notice I left out Avenue. IMHO that along with ArcView was a mistake and luckily did have a short shelf life. (And somehow I never spent much time or energy with it...)
That should just about do it....