As Maudland reminds us, the question was whether
druthers should continue to be treated as a common word.
In the discussion, some felt it shouldn't be accepted as a word at all, for various reasons.
As people have said, it's a colloquialism derived from "I'd rather", and used especially in some US regions. However, I believe it's not quite as rare, or as regionally restricted, as people seem to think.
Most dictionaries list
druthers, rather than
druther. Occasionally one sees "druther" in a publication, but usually in dialogue, as a representation of how a character says "would rather". But the derived word
druthers means preference, often in the phrase "If I had my druthers..." A typical example is from this forum, way back in 2007, when our first forumite, biggerbirdbrain, wrote:
If I had my druthers, I'd just keep two homes -- one for winter (in the south) and one for summer (just a little less southerly) and never see winter again.
As jem01060 says, there is no singular form corresponding to
druthers. Hence
druther is not a word and
druthers is.
As for my claim that
druthers is more widely used than people seem to think, look at this, from the News on the Web corpus:

It seems that the word is used most often in Canada and Australia, with the US coming in third! Of course the usage patterns in online newspapers may not reflect usage in daily speech. Nevertheless, it is clear that quite a few journalists around the world have occasionally used
druthers. Some examples from Australian publications:
Clearly, if the government had its druthers, the Reserve Bank of Australia would have waited until its next meeting in June to raise rates.
Australian Financial Review
Autumn leaves or wood chips or sawdust are my favourites, as they are most easily available, but if I had my druthers - and enough money - it'd put down a thick mulch of pea straw or lucerne hay, then layer compost thickly on top of that.
Canberra Times
But if Morrison had any further regrets, it would be that his privatisation druthers had been revealed.
The Saturday Paper
So, the new coach will get his druthers, but that authority comes at a cost...
The Age
Many of the arguments raised against voluntary voting rely upon the resigned assumption that, given their druthers, most people could not be bothered voting.
ABC Online
Nevertheless, I accept that the word is not common, so it will be treated as rare in future.