Yes, it's changing. Fortunately 'my' branch of the family picked 'ij' so we're in the clear ;) But for some of the older members it is causing all kinds of trouble, especially when interacting with the authorities, more so if one set of documents uses 'ij' and another through accidents of history uses 'y'. Some schools even teach 'ij' as the 25th letter of our alphabet, when they really should be using 'y' for that spot and 'ij' as a two letter combination.

Also, when spelling words people use 'ij' as a single letter for instance a Dutch person would spell 'mijn' as 'm', 'ij', 'n' (and they would likely not say 'lange ij' because there is no word 'mein' in Dutch.

It also causes no end of trouble with storing and searching because a Dutch person might expect IJ to be sorted after 'X' but instead it appears sorted as the combination I J . The fact that different reference works use different methods doesn't help either.