The only way that can happen is if several red state legislatures agree to the Compact. This Compact is useless to replacing the Electoral College if only blue states sign up; these states would have voted blue in an election, anyway. It tips over to 270 if several red states sign up and allocate their electoral votes against the wishes of their own red state constituencies. Would that be democratic? It is obvious why the growth of the compact has stalled at 209 votes; it is irrational for a red state to join it. It is also true in the mirror image if it were a "red state 270 vote compact," no blue state would join it.
The only way that can happen is if several red state legislatures agree to the Compact. This Compact is useless to replacing the Electoral College if only blue states sign up; these states would have voted blue in an election, anyway. It tips over to 270 if several red states sign up and allocate their electoral votes against the wishes of their own red state constituencies. Would that be democratic? It is obvious why the growth of the compact has stalled at 209 votes; it is irrational for a red state to join it. It is also true in the mirror image if it were a "red state 270 vote compact," no blue state would join it.