It seems to me the issues are: 1. Will MQA hegemony mean that other high resolution formats on download sites disappear ( ok for those who already have this content, but not newbies)
2. MQA will become defacto the only way to play back high resolution content as you need a compatible dac and it has DRM code
3. MQA SQ is subjective and track dependent( like most formats actually), from a technical stand point it is not a superior format, but an engineering compromise with some remastering effort, the amount of which is done is unclear. The compromise appears to be that they cut areas where there is little actual substantive musical content, and allow artefacts to be present in return for a small package size, and remastering and filtering SQ improvement, some of a measurable and others subjective manner.
From what I've heard so far, the risk of playing MQA files on non-MQA DACs is 50-50, in the sense that some sound brighter on an MQA DAC, and better in that sense at least on a non-MQA DAC. If that were to hold long-term (no assurance of that), then making sure to have a non-MQA DAC would offer some limited assurance against DRM.