sounds like an arduino cloud ....
I don't like it, not because it is a bad idea but because working with a real Arduino is an existential part of the experience (for me), feel the wires, turn the potmeter, see the bright led flashing your left eye, see that crawling servo etc
And I just cannot run a virtual arduino in my greenhouse with a virtual ds18B20 and a virtual servo to open the window 
Think there will be a market for this idea, classrooms etc. beware that the usability depends heavily on the user interface..
PS, existential is no typo