Yeah, Sentai's QC is a concern as well. And of course they could throw Stephen Foster on as English ADR writer/director and boom, bleah.
Anyone who knows me knows I'm pretty darn pro-subtitled anime. I agree that dubbing LOGH won't make it that much more appealing to today's teen-tween MOE-centric fan. Dubbing would be mostly for us old pharts. But it just might be critical, as there ARE a goodly number of our generation (and I note, it's not really an age thing so much as a mindset-perception thing.) who are, oddly, rabidly Dub Only.
And of course, a dub is essential if one hopes for any kind of broadcast or narrowcast (i.e. streaming) use.
One way to keep the costs of a dub down would be take the Star Blazers route, cast it entirely with unknowns, cast for decent natural voices. Grab stage-trained actors. Raid the local summer stock companies. And do it ALL at once. One massive, months long block of recording sessions. Don't do the "we'll record a disc's worth this month, and bring people back for the next disc in 6 weeks" crap, let everyone BECOME their characters from familiarity.
(can you tell I've been thinking about something like this for some time? hehehehehe)
Honestly, as hard as it would have been for them, I, too, would have preferred Discotek to have picked this up. But then again, who knows what THEY have up their sleeves?
Supposedly someone at their panel asked about an English dub and they basically said "we'll see". 
