Lose our soldiers and stuff, just like that?
No.
And anyway, this is already emulated via enemy craft scrambling to intercept us when we approach the alien base's detection radius, which admittedly depending on vanilla/mod can can be bypassed with a bit of cat and mousing, or disabled by design.
But for a hypothetical direct defense, our craft entering the interception phase upon reaching the enemy base is more sensible from the end-user's perspective, but probably a whole lot of pain to actually implement.
EDIT: Thinking about it, can the base be "escorted" by what is basically an immobile "UFO", similar to how UFOs are forced to engage with our escorting interceptors first (when properly ordered) when we send our planes in a group?