Can we have more than 2 apps side by side with split view in El Capitan?

Nope.

Any answer would be pure speculation. Apple does not announce future plans.

jolivetinsar wrote:

And does anyone know wether there is any chance it happens some day? That would be very useful when using multiple terminal windows for instance, especially since displays can be quite large with high resolution now.

There is nothing restricting you from adjusting the size of the windows to your liking. Not exactly full or split-screen but there is no difficulty in arranging three Terminal windows in pretty much any way you want. You can even set "focus follows cursor" mode that some people prefer.

Plus you can create a Window Group so you can easily restore the arrangement of windows at any time - or check a box and have Terminal start with exactly those windows at exactly these locations.

Any alternatives?

Such as what?