If the makers try to do this, they will lose TV audience. The online craze is majorly for ShiVi, and less for the family story, so they might still continue watching for the sake of KDIce. But the regular audience may find it extremely hard to digest the idea of a married couple giving up their child to a relative (without a strong compelling reason such as their death), especially since they've already made such a mess of the pregnancy & the IVF track.
9 10yr ago in YRKKH, the sister of ML was not able to conceive and her saasu maa suggested that they should ask to adopt the baby of the pregnant lead, however everyone in the family denied and the couple went on to adopt a baby from orphanage.
But in PS, you can't expect something progressive