Perfect sense although you say there's no 3rd party like payza, TenX would essentially be a 3rd party, but without visa/Mastercard it's going to be worse than holding a AmEX or Switch card right? Very few payment teminals and atms will accept them? In the UK at least.
The other risk factor is the card is not a 'Dashpay Card' TenX supports other cryptocurrency right? And I'm guessing will intend to expand in the future, why should Dash be the only cryptocurrency that pays directly for the service?
Personally I would invest in this but I don't think it will benefit dash for usability. Have you applied at Bnktothefuture.com ? It seems better pitched to the wider crypto community, unless its rebranded exclusively for dash and the dash app to be released and is then a feature of that but that would require acquisition from evolution.