I disagree.
As long as the York girls start to focus on school and duties on behalf of the Queen and later King Charles, interest will remain somewhat the same. When Harry and William start marrying and having kids....people will start to care less about the York girls. But until they (William and Harry) have kids...Bea and Eugenie are still 5th and 6th in line to the throne...I know it bothers some people (no ne on this forum that I am directing this to) but there you have. FIFTH and SIXTH...until Wiliam and Henry have kids (and with their chosen careers....anything can happen) they are very much a factor.
I agree, Beatrice and Eugenie are fifth and sixth in line to the throne. Yes, someday (barring a tragic accident) Charles and his sons will carry the brunt of royal duties, and later on it will be William and his family as Harry's children become more remote from the throne, but...until William and Harry do have children, anything could happen. Even in the last 75 years, there have been tragic and untimely deaths in the royal family: the Duke of Kent, Prince William of Gloucester, and even George VI who was in his fifties when he died. Members of the royal family have died without children in the last 50 years (Edward VIII, who remained unmarried until his forties).
I just think people are sometimes too hasty to assume that William and Harry will both marry and have children and carry on the family line, or that this will happen before Charles ascends the throne. Things don't always work out that way in life. And even if they did...take this fairly believable scenario: The Queen dies aged 100 in 2026, so we're already assuming she lives a very long life. At this point Charles would be 77 or 78. Now suppose William has married in his early thirties and had his first child around the age of 35 in 2017--not a stretch of the imagination at all. His children at this point would be under the age of 10 and wouldn't be carrying out any royal duties for at least another decade. Now suppose Harry is still a bachelor at 42--not a huge impossibility. That leaves an elderly Charles and Camilla (assuming she's still alive), William and his wife, and Harry. Even if Harry were married, that's only 6 people, two of whom are elderly. And anything could happen to Harry or William.
I can understand people wanting to end public duties for the more minor members of the royal family, I just don't see Andrew and his daughters as being all that minor. Yes, when William and Harry's children are grown up I wouldn't see the need for Beatrice and Eugenie to do royal duties but until that point, I think they are still too close to the throne to go and live an anonymous life. That's why the royal family has a line of succession, isn't it?--so that someone will be there to take the throne "just in case" something happens to the next-in-line. Yes this might be stretching it a bit, but it's not out of the realm of imagination: what if a terrorist managed to kill William in my first scenario? That would leave Charles and Camilla (who aren't going to have any more children), a couple of young children, and Harry who has no descendants to take his place.
I think Beatrice will probably take a gap year after she graduates from college, maybe get a few years of work experience somewhere, but gradually take on royal duties. I think Eugenie will probably do the same, because I can't see the two sisters having totally different roles in the RF.