If you transffered at the start of the year then you would have essentially up to 3-5 years expiry wouldn't you? Forgot how it exactly works, as I'm sure one of the SQ gurus can clarify the exact method.
IIRC you can essentially book flight 355 days in advance (3 years + 355 days) then change dates later on (3 years + 355 days + 355 days), which I guess brings it close to a 5 year expiry.
Or extend your points expiry buy paying with points? then use the above methods to make it 5+ years.
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If you have heaps of points to burn and want to go Europe, try and book the new suites (Advantage fare only) if you haven't tried yet as that'll burn through some points.
I didnt know of the extending option, i assumed the max is 4 years, book at the end of 3 yrs for a year later, but if you cancel, youd lose your points, so you have to be sure,