BD will remain stronger than MM militarily, and I do not see any direct involvement in a war either by China or India. These two countries may support MM in the diplomatic field, but not in ground action. Pakistan may work for BD, but its position has been neutralized by its agreeing to sell JF-17.Bangladesh is stronger than Myanmar on its own theoretically I agree. However the equation is not Bangladesh vs Myanmar only. Rather both India and China have sided with Myanmar. In such a scenario Bangladesh stands no chance as only support from a country the size of the US would balance things. Such a move is not forthcoming. Pakistan, Turkey, Iran etc are not capable of turning the tide on such a balance of equation, hence why Myanmar is acting with such impunity. If Bangladesh had either China or India on its side then it could realistically have stood a chance in a conflict but that is not the case.
Could it be that Pakistan will create another east Pakistan in Arakan? I doubt it, though the Arakanese Muslims of today love to study in Urdu instead of Bengali. Other Muslim countries will support BD in the diplomatic field. So, BD and MM will have to fight by themselves with the possibility that they will readily accept an international arbitration brokered by the USA.