The answer is: the minister has the final say. Sorry, this answer is a bit boring, but it is.
Explain that the basis for the end of April is that FSW 2014 will be said to be good for one year, but this “say a good year” cannot guarantee anything.
Looking back at the CEC 2013.11.9 New Deal, it was said at the time:

Between November 9, 2013 to October 31, 2014, Citizenship and Immigration Canada (CIC) will accept a maximum of 12,000 new applications under the Canadian Experience Class (CEC).

But people have also said that the new ministerial directive can change this policy at any time. Sure enough, in April this year, the new ministerial order came out:

As of May 1, 2014, there is an overall cap of 8,000 for new Canadian Experience Class applications. There are also sub-caps of 200 for each National Occupational Classification B applications.

That is, the number of used quotas is cleared to 8000, and the caps of all subcategories are also cleared. Of course, this ministerial order is a good thing for CEC applicants, especially the preschool education and program test technicians who are running out of 200.
I bet that the new ministerial order at the end of this year will definitely come out. This ministerial order is not necessarily a good thing.
The most pessimistic estimate of the last bus of the FSW is that the Express Entry will be implemented at that time. All applicants who wish to submit the FSW will need to submit the information to the pool first. After all, they have long said that Express Entry will begin in January next year.