Yeh it might be a possible caus if bitcome gain more popularity than liquid cash or any other kind of e-cash transfer..but this will not happen in near future..it may take long time for bitcom to gain popularity..
Yes the possiblity is there but then it takes time a long long time to happen because we do not know how bitcoin will gonna work someday, once the government support bitcoin for sure people will gonna make pump up everywhere like banks and there if people transfer from bank to bitcoin for sure bank will gonna disappear