Fully agreed. Brexit voters wanted to leave the EU because they wanted more sovereignty; parliament is sovereign, and have been unable to determine any form of Brexit which they wish to pursue. They have now voted on all those forms of Brexit, and should not do so again because to vote again would, as you say, be ignoring the will of our sovereign parliament. Hence, by the logic you're promoting, remaining within the EU (the default option) would be our only option, and would represent British democracy in action.