I think expert opinion is wrong here and has been wrong since 1972, when the Western World began trying to intervene and impose a solution in the Israel Palestinian conflict.  
The irony of the situation is that an unequivocal Israeli claim on all of Jerusalem could be the action that gets the Arab world motivated into negotiating a peace settlement for the two parties.  Remember that up to now the Palestinians and Arab world have lived in a state of undeclared war with Israel.  Remember also that there is nothing sacred or permanent about East Jerusalem, which ironically is the historical Jewish Quarter of Jerusalem and was only made Arab in a series of pogroms and massacres in the 1920s and 1930s . By declaring the permanence of Israel and its capital with an embassy relocation the Palestinian leadership will have a new chance to make a peace or face irrelevance.   This is better than the status quo.  So I wish the architects well in their new construction project.