If your plan in the future is to gain canadian experience, you are eligible to apply for pgwp but then again, it is up to you if you want to do it at the end of your study. This application is only for your SP and what happens after is up to you so long as you don't overstay or without legal status. Future plans are up to you, don't over think this part. You will be assessed on PGWP with different eligibility requirements and so long as you meet these requirements, no reason for rejection other than if you have done anything that is unlawful, if your school/program doesn't qualify for PGWP or your found inadmissable. Right now your main concern is to make sure they are convinced that you are a genuine student and that you are fully aware of the conditions of the visa.