The cost of repurchase of music regarding MQA for most is in all probability not as high as some fear.
Subscribers of Tidal will incur no extra expense if the stated aim of continuing with the current charging model is maintained.
Purchasing of downloads as replacements to existing libraries will surely be restricted to those that are played reasonably frequently. Those with libraries consisting of thousands of files are unlikely to play more than a small proportion more than once or twice so will in all likelihood be not inclined to purchase MQA versions of something that has not been played in the last five years, In my case Dark Side of the Moon - yes, Ummaguma - no
The analogy that springs to mind is that when I occasionally buy a movie, if I feel I will probably only watch it once then a standard DVD will suffice unless the price difference is minimal between it and Bluray. If I'm likely to watch it more than once then Bluray is my option. Now I come to think of it, the same applies to hardback and soft back books.
Of course, some will disagree but most of us have limited resources and will therefor cut our cloth accordingly.