It is difficult, but not impossible to get concierge.
I rented from an owner I had previously used for a vacation a few years ago at WDW. He called DVC at the 11 month window, right when it opened up (I guess he doesn't do it online). He didn't walk the reservation either (nor would I have expected him to do that.)
Got standard view (studio) in Jambo and waitlisted the 3 nights for concierge (I was deciding whether to waitlist concierge as #1 or value as #1 and finally decided to waitlist concierge as #1). About a month later (so 10 months prior to trip), got an email from the owner, forwarding DVC's email that the waitlist came through!
21 more points but there's three of us (possibly four) going, so splitting that extra cost is well worth it!