I also think that VR market will grow fast soon. As many said, in the following 2 years VR will probably be more present and a lot of people will use it, like blockchain I think. Mark.Space have some time to developp something big.
It is growing but the equipment is a bit expensive, if mark.space can have a mobile version of there platform that can be easily access by any VR capable smartphones that would be great.
I believe they already mentioned that it is being built so that it works on any platform basically, which is best of course. Like you said, VR smartphones are easy to use.