The End of Tripartite Government?

The American Bar Association report (summary here, full PDF report here) on the abuse of presidential signing statements by is the latest dead canary in the metaphorical mineshaft of this Republic warning of grave danger to its future as a nation of laws. One needn't go so far as to compare the current state of this administration to the genesis of European dictatorships early in the last century to be alarmed. While we may not be on the path to fascism or tyranny, we are on racing headlong towards having an elected emperor with the other two branches of government reduced to ceremonial anachronisms.

Should Congress and the Judiciary not act to quell this presidential power grab -- essentially a unilateral rewriting of the Constitution to eliminate the possibility of veto overrides -- how long will it be before the elected king decides to ignore other troublesome parts of the Constitution like Article II, Section 1 (presidential term of office and means of election) or the 22nd Amendment (presidential two term limit)?