What is the "drawing in the crowd" issue about? Do you feel a lack of desire to play other classes just because of the ability point? What crowd?
Yes, human will likely be the most popular class (would be anyway) for whatever reason. But people will still play all 4 classes, and I don't think BW will take classes "out" again like they did in DA2 (they learned that lesson), as long as this game does well.
What exactly is the worry?
The worry is that if they prove to not be a worth while feature, which they were pretty much a waste of time from a purely objective POV for Origins that they will be removed again,
And in this game it's even worse then Origins, since they have the most broadly appealing Bonus and two fairly different backgrounds, they are stacking the deck in favor of the guy who can already count cards as it were,
It would be very hard to justify putting in more races if they were even less played this time, And i won't ask BW to throw away money on an inefficient feature, that serves little purpose, After all as long as you can change ethnicity and gender you only really need humans,