Ok, there have been many times when this seemed possible. But why now? The fact that this has happened a week before the annual conference seems suspicious.
I suspect more will come out in the coming days.
Plaid have issued a statement, in it the party is calling for a by-election:
“Plaid Cymru will begin the process of selecting a new candidate in Dwyfor Meirionnydd following Dafydd Elis-Thomas’s decision to leave the Plaid Cymru Assembly Group.
“Constituents, who Dafydd Elis-Thomas misled in the recent Assembly election, will expect a by-election to be held at the earliest convenience.”