Conversation so far:
Why did Alexisonfire cancel their fifth studio album?
Alexisonfire announced they had been writing new music for their fifth studio album. However, on August 5, 2011, Alexisonfire announced their intent to break up after Dallas Green left.
When did Dallas Green announce his departure from Alexisonfire?
Dallas Green announced his departure from Alexisonfire in 2010.
What happened after Dallas Green announced his departure from Alexisonfire?
On February 14, 2011, on their official Twitter page, Alexisonfire announced they had been writing new music for their fifth studio album.
What was the response to Dallas Green departing from Alexisonfire?
George Pettit cited Dallas Green's departure from Alexisonfire to focus solely on City and Colour, Wade MacNeil's departure to join another band.
When did Alexisonfire's farewell tour begin?
In December of 2012-15 months after their breakup announcement—Alexisonfire embarked on their international, farewell tour with stops in Canada, UK, Australia and Brazil.

Question: What did they decide?
Self-contained rewrite: What did Alexisonfire decide after the break up?