Yes the 54 team most likely will shut down, no sponsor, Sam Belnavis I think left for Roush Racing according to Jayski.com.
However I have heard that Travis Carter is helping to organize his other team, maybe the #66 originally piloted by Hideo Fukuyama will now be piloted (according to rumors around the net) by British Driver John Mickel, that and a British Racing Organization will help back the team or possibly combine with Travis Carter Racing, or whats left of it.