T-Mobile USA has been highly disruptive in the mobile market, but has not had the same impact, so far, in the video space, despite its lofty ambitions. A distribution deal it signed last week with Viacom is a significant one – but still, the Uncarrier will have to do better than signing to distribute old hat TV channels, if it plans to unsettle the established players in the mobile-first video market. The T-Mobile fascination is waning – could missing the boat and flopping into the sea of over-the-top (OTT) video corpses become a reality or will T-Mobile really pull something successful out of the bag? The disillusionment started to set in with the operator’s disappointing change of strategy in mid-February,…