Let me first say: I really hate Twitter, due to it's truncated nature, it's not really useful for soliciting feedback. In fact, I don't really find it useful for anything other than hurling knee-jerk reactions and barbs at others, which is why I don't have a Twitter Account.
That out of the way, how the the poll is worded implies "All other things in D&D being the same, what one thing would you like the druid to keep if we butcher it?"
You can use a Nature Priest for your "nature themed" religious full spellcaster.
You can use a Beastmaster Ranger for your nature themed animal master.
But there is no easy analog for a Shapeshifter.
And that's only if you are going for a strict analog, Fey Pact Warlocks, Oath of the Ancient Paladins, and all kinds of Rangers can also fill the Mystical Nature Worshiper who works with creatures niche to various degrees.
If you are going butcher a class, you might as well keep the part that is relatively unique.