This is an interesting hypothesis, and is largely dependent on what type of page is most likely to be edited. I would agree with you on large pages. But large, very popular pages are often likely to be difficult to edit for other reasons, or even semi-protected. The long tail of Wikipedia articles in all languages have maybe one or two sections at best, including References. Most articles are stubs. 

In any case, I don't see that prioritization in the design of winter right now. Section edit links are very subtle visually. Also, they are moved back to the right, though A/B tests ran by Trevor suggest that putting them near the title with an icon was superior in conversion to editing. 
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