I'll buy DVDs (sometimes even of titles that I already have) but I do not feel that I must replace EVERYTHING in my collection.
As to laser rot, I am well within my legal rights to transfer a film from LD to another format (hometaping) whether that new format is recordable DVD or whatever.
There are some things I doubt that the studios will release again (especially when there were less than 1,000 copies of some LDs pressed). It was a niche market and was not as prone to controversy.
I don't feel I have to replace everying in my library either. I enjoy both formats...
Seems to me that laser rot was finally traced to one asian pressing plant that did not sufficiently filter the water used to wash the aluminum surface before it was pressed between the plastic. Once that was "solved" the problem was licked for new discs from that source.