If you actually manage to go off grid then yes, maybe you are able to save. Good luck doing it without either massive lifestyle change or tons of capital for storage in most of the world.

Once you take the feed-in away the benefit is not so clear cut. Also, many people dump the externalities of home solar on everyone else (the negative spot electricity price) and then use cheap power from the grid for most of the 24h cycle

Where do you think going off grid is so viable?