There are actually a couple of other practical reasons, signal aside, why Entercom probably won't be in any hurry to do separate programming now on 107.7.
The most important is this: in order for WBEN and WLKK to appear in Arbitron books with their ratings combined ("single-line reporting"), they must be 100% simulcast - no separate commercials, no separate traffic reports, nothing. And if one of the purposes of the WBEN/WLKK simulcast is to push WYRK out of the #1 spot in the 12+ beauty-contest numbers, they have to have single-line reporting. (Otherwise, we probably wouldn't have heard the Sabres on 930 during the playoffs, just on 107.7.)
And then there's this: it's economically impractical for any station on the US side of the border to program to local audiences and local advertisers in Canada, because of the way the Canadian tax system is set up. Canadian businesses can deduct the cost of advertising in Canadian media as a business expense, but they cannot deduct the cost of advertising on US-based media outlets. That's why you see so few Canadian ads on Buffalo TV compared to the 1960s and 70s. The few outlets that manage to do cross-border sales do so by selling to national advertisers, infomercials (WUTV and WUHF in the mid-morning and late-night hours) or to religious and ethnic broadcasters who can't buy airtime in Canada (WTOR).
But a news format aimed at Canadian listeners, even if you could put it on a signal (unlike 107.7) that reaches Canada, would need the money of local advertisers to survive...and it couldn't get that money from the Canadian side...and there are only so many Seneca Niagara ads to go around.
