Changes to a menu, although necessary to keep options current and new and to compete well with your nearby rivals and the internet, are always I find, a balancing act.
Personally, I’ve always thought that the newer food trends tend to appeal more to the younger/lower middle age market while the old favourites are enjoyed more by people in middle age, late middle age or the elderly. I suppose part of my thinking here is that by the time most of us reach a certain age, we know what we like - especially us Brits!
On the opposite end of the scale, if a Michelin starred restaurant was to lower its game overnight and suddenly cease providing as much variety in the form of a daily a la carte menu with only the finest local ingredients reflecting the changing seasons whilst introducing new food trends, then this for them would I imagine, pretty quickly lead to their demise.
I think at the end of the day each of us out there, as competent business people know what works for OUR business and over time develop a kind of instinct for what is right. I personally, as somebody that has always enjoyed working with food, experimenting with different ingredients and tasting new dishes, have always been keen to share these ideas with consumers. I think that is a natural want as a Chef, right?
My advice, though, would be not to run before you can walk. As tempting as it is to introduce new dishes for people to try continually, be sure it IS what’s wanted first - your survival could depend on it!