I am pretty sure the following audio companies have agreements in place to implement MQA into their current or upcoming hardware.
Audioquest (Dragonfly)
Aurender (A10)
Auralic (maybe???)
Bel Canto
Bluesound (Node, Vault series and Soundbar)
NAD (M12, M50, M32, C 390DD, M502...)
Brinkmann
CanEVER
Cocktail Audio (X35)
dCS
Esoteric
IAG
Krell (Vanguard)
Mark Levinson ( No519)
LG (LG.V30 smartphone)
Lumin
Meridian (many products)
MOON by Simaudio
MSB
Mytek
Onkyo
Pioneer (XDP-100R)
PS Audio ( PS Audio DirectStream)
Pro-Ject ( now owner of Musical Fidelity)
Sony (NW ZX300 and NW-A40)
Teac
Technics ( SU-G30)
Wapax
Nevertheless, so many more companies are not going the MQA route.
There are so many formats to choose from and vinyl has made such a come back, I don’t see the problem. Artists will contine to find ways to use computers and the internet to create and distribute their music and with the ever increasing wide bandwidth for streaming hi-res files, I don’t see MQA causing the sky to fall.