Will the nose go back to its original shape after silicone implant removal?

    Usually there is some soft tissue thinning at a minimum.   You can certainly remove the implant and then wait to reconstruct.  Kenneth Hughes, MDLos Angeles, CA

Many patients undergo rhinoplasty utilizing artificial implants. These implants offer the convenience of being ready off the shelf and can be available when the patient has insufficient cartilage/bone to complete the rhinoplasty. Artificial implants such as silicone generally work OK but have their own unique issues. These issues include infection, exposure, and seroma. This can occur at any time - even years after implantation. Generally speaking, the placement of an L-strut typically represents the supporting structure for the bridge of the nose. Removal would often require replacement with something else to prevent collapse.

In short - no, unlikely.The tissues will have been altered (both the skin and cartilage).  You might need to have some cartilage added to restore the original appearance.