I've got to agree that getting points will be tough.
Honestly, rarely do I travel domestically on Y/B fares.
Internationally we've been travelling on them (and Z fares in one case), but still, 5 or 6 international trips in Y just barely make the first tier.
You've gotta be red hot to get the upper 1000+ point tiers.
I'll be first tier at best.
Steve