Technology, yes! The thing is, I have so many DVDs which you can't find on any legit streaming service and there is always the threat of cancel culture, so don't get rid of everything!  The key is to recognise the shift as early as possible and move stuff on in order before no one wants it.

My father started off in the eighties with collecting Betamax video tapes.  He was a big believer in this format, then admitted defeat and switched solely to VHS by the late 1980s, doubling up on a lot of titles.  Then they started releasing widescreen hi-fi stereo VHS titles in the mid-1990s and he re-bought the titles again on this format, also getting a widescreen CRT TV.

Then DVD came along at the end of the decade and he bought them all again (this is now format #4).  Then Blu-ray arrived and he did it again!  He wasn't around to see the shift to streaming but I'm sure he would have loved that.