Olivier,
As it is you proposing this it must be awesome, but I am not familiar enough with what you are proposing to fully understand. Could you elaborate?
For example you say:
"You could get profile from lines on the plan, for an extrusion of an object, link object together, actually everything for parametric modelling." We can make a custom profile from linework and get an extrusion, but what kind of linkage are you proposing?
and
"You could even make something like history+grasshopper in Rhino.
And you could algorithmically generat buildings instead of closed objects."
Not having used Rhino I don't know to what you are referring.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"