First, an apology if this idea has already been posted in some other form.
I believe PM could atract more customers by offering additional add-ons for anyone who has selected at least 1 standard item (calling, texting or data) for 30 or 90 day plan; i.e. a real smorgasbord.
Here's a tentative list:
250 MB data $15
500 MB data $20
1 GB data $30 (already allowed)
250 minutes Canada wide calling $15
500 Canada wide sent texts $15; incoming free
International & NA long distance add-ons would continue to require a calling plan.
My reasoning is simply that PM has already shown that a 1 item plan generates adequate revenue, so capturing additional revenue should help it survive.