They will continue to support the car. Looks at their track record, only recently did they stop producing parts for the XX cars. They are still pumping out XXX-S sedans and parts. Horizon is changing the face of Losi - they might not develop as many new parts for the car since it's not as popular as their other products but they will continue to sell replacement parts and kits.
The unfamiliar design did not help them, I think the big reason the TC5 was a huge hit was it's just an anodized blue FK'05 which everyone was already familiar with. Had Losi built a car that looked more like an XRAY and used their colors on the alloy it would have sold more units and been more popular on the forums.
It's too early to throw in the towel on the car though, it's too good..