Bancor team must have done a real good job with their marketing selling this idea and this not practical in real life, even the team can't support the floor they promised, unless something indeed changed quickly, this might be one of the ICO project to go under
What's not practical in token changers? It's the most practical thing for ICOs to guarantee liquidity for their contributors holding tokens. Price floor is whole different story, but it was working as intended while there still was reserve.